The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Eiji Takayamamuromachi - One of the best experts on this subject based on the ideXlab platform.
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crystal growth and structure and Magnetic properties of the 5d oxide ca3lioso6 extended superexchange Magnetic Interaction in oxide
ChemInform, 2010Co-Authors: S Yu, Masao Arai, Akira Sato, Alexei A Belik, K Yamaura, Eiji TakayamamuromachiAbstract:Single crystals of the new title compound are prepared by a flux method from mixtures of Ca3OsO6 (obtained from stoichiometric amounts of CaO2 and Os, Pt capsule, 6 GPa, 1500 °C, 1 h), LiCl, and KCl in a mass ratio of 1:5:2 (Pt crucible, 750 °C, 12 h).
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crystal growth and structure and Magnetic properties of the 5d oxide ca3lioso6 extended superexchange Magnetic Interaction in oxide
Journal of the American Chemical Society, 2010Co-Authors: S Yu, Masao Arai, Akira Sato, Alexei A Belik, K Yamaura, Eiji TakayamamuromachiAbstract:Crystals of the newly synthesized compound Ca3LiOsO6 were grown by a flux method using LiCl and KCl, followed by single-crystal X-ray diffraction (XRD), low-temperature powder XRD, and measurements of ac and dc Magnetic susceptibility and specific heat. The data indicate that Ca3LiOsO6 has a fully opened electronic gap with an antiferroMagnetic ordered state, consistent with suggestions from the first-principles study. The observed Magnetic transition temperature is 117 K, too high to be caused only by a direct spin−spin Interaction. It appears that the original superexchange Magnetic path Os−O−Os is absent; thus, the extended superexchange path (Os−O)−(O−Os) can be expected to be responsible for the 117 K Magnetic order. If this is true, Ca3LiOsO6 would be highly valuable to study the nature of extended superexchange Magnetic Interactions in solids.
Shlomi Kotler - One of the best experts on this subject based on the ideXlab platform.
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measurement of the Magnetic Interaction between two bound electrons of two separate ions
Nature, 2014Co-Authors: Shlomi Kotler, Nitzan Akerman, Nir Navon, Yinnon Glickman, Roee OzeriAbstract:The Magnetic Interaction between two electrons is measured at the micrometre scale, exhibiting spin entanglement generation over 15 seconds of coherent evolution; varying the inter-electron separation shows a distance dependence consistent with the inverse-cube law. Every electron carries an intrinsic Magnetic dipole moment, so any two electrons should therefore exert Magnetic forces on one another. The forces involved are very small, and at atomic scale Coulomb Interaction is dominant, so it is extremely difficult to observe the Magnetic Interaction. However, Shlomi Kotler et al. have now done just that, measuring the Interaction between two electrons, in separate trapped strontium-88 ions. The two electrons exhibit spin entanglement generation over 15 seconds of coherent evolution, and by varying inter-electron separation the authors demonstrate distance dependence that is consistent with the known inverse-cube law. Electrons have an intrinsic, indivisible, Magnetic dipole aligned with their internal angular momentum (spin). The Magnetic Interaction between two electronic spins can therefore impose a change in their orientation. Similar dipolar Magnetic Interactions exist between other spin systems and have been studied experimentally. Examples include the Interaction between an electron and its nucleus and the Interaction between several multi-electron spin complexes1,2,3,4,5. The challenge in observing such Interactions for two electrons is twofold. First, at the atomic scale, where the coupling is relatively large, it is often dominated by the much larger Coulomb exchange counterpart1. Second, on scales that are substantially larger than the atomic, the Magnetic coupling is very weak and can be well below the ambient Magnetic noise. Here we report the measurement of the Magnetic Interaction between the two ground-state spin-1/2 valence electrons of two 88Sr+ ions, co-trapped in an electric Paul trap. We varied the ion separation, d, between 2.18 and 2.76 micrometres and measured the electrons’ weak, millihertz-scale, Magnetic Interaction as a function of distance, in the presence of Magnetic noise that was six orders of magnitude larger than the Magnetic fields the electrons apply on each other. The cooperative spin dynamics was kept coherent for 15 seconds, during which spin entanglement was generated, as verified by a negative measured value of −0.16 for the swap entanglement witness. The sensitivity necessary for this measurement was provided by restricting the spin evolution to a decoherence-free subspace that is immune to collective Magnetic field noise. Our measurements show a d−3.0(4) distance dependence for the coupling, consistent with the inverse-cube law.
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Measurement of the Magnetic Interaction between two electrons
Bulletin of the American Physical Society, 2014Co-Authors: Shlomi Kotler, Nitzan Akerman, Nir Navon, Yinnon Glickman, Roee OzeriAbstract:Electrons have an intrinsic, indivisible, Magnetic dipole aligned with their internal angular momentum (spin)1. The Magnetic Interaction between two electrons can therefore impose a change in their spin orientation. Similar dipolar Magnetic Interactions exists between other spin systems and were studied experimentally. Examples include the Interaction between an electron and its nucleus or between several multi-electron spin complexes2–8. The process for two electrons, however, was never observed in experiment. The challenge is two-fold. At the atomic scale, where the coupling is relatively large, the Magnetic Interaction is often overshadowed by the much larger coulomb exchange counterpart2. In typical situations where exchange is negligible, Magnetic Interactions are also very weak and well below ambient Magnetic noise. Here we report on the first measurement of the Magnetic Interaction between two electronic spins. To this end, we used the ground state valence electrons of two Sr ions, co-trapped in an electric Paul trap and separated by more than two micrometers. We measured the weak, millihertz scale (alternatively 10−18 eV or 10−14 K), Magnetic Interaction between their electronic spins. This, in the presence of Magnetic noise that was six ∗Current address: Physical Measurement Laboratory, National Institute of Science and Technology, Boulder CO, 80305, USA. †Current address: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB30HE, United Kingdom.
Kizashi Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Investigation of the Magnetic Interactions of Ni9 Complexes
Journal of Physical Chemistry A, 2008Co-Authors: Mitsuo Shoji, Mitsutaka Okumura, Yasutaka Kitagawa, Takashi Kawakami, Shusuke Yamanaka, Kizashi YamaguchiAbstract:On the basis of density-functional theory (DFT) calculations, a theoretical analysis of the exchange Interactions in Ni9L2(O2CMe)8{(2-py)2CO2}4, was performed, where L is a bridging ligand, OH- (1) or N3- (2). Each Magnetic Interaction between the Ni spin centers is analyzed for 1 and 2 in terms of exchange integrals (J values), orbital overlap integrals (T values) and natural orbitals. It was found that a J3 Interaction, which is a Magnetic Interaction via the bridging ligand orbitals, mainly controls the whole Magnetic properties, and the dominant Interaction is a σ-type orbital Interaction between Ni dz2 orbitals. Further investigations on the magnetostructural correlations are performed on the J3 Interactions using simplest Ni−L−Ni models. These models reproduced the Magnetic Interactions qualitatively well not only for the Ni9 complexes but also for other inorganic complexes. Strong correlations have been found between the Magnetic orbital overlaps (T values) and the Ni−L−Ni angle. These results reve...
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Theoretical studies of Magnetic Interaction of organic π-radicals on gold cluster surface
Polyhedron, 2007Co-Authors: Mitsutaka Okumura, Yasutaka Kitagawa, Takashi Kawakami, Kizashi YamaguchiAbstract:Abstract Nanoscale Magnetic material is the important topic in nanoscience and magnetism. Especially, gold nanoparticles chemisorbed by alkanethiols are one of the promising material for these purposes. However, Magnetic Interaction of Magnetically active ligands grafted onto the surface of gold nanoparticles has not been investigated in detail. In order to elucidate the Magnetic Interaction in gold nanoparticles chemisorbed by alkanethiol systems, small slab gold cluster, such as Au10, and π-radical hybrid model systems were examined using the hybrid DFT method.
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Theoretical study on the Magnetic Interactions of active site in hemerythrin
Polyhedron, 2005Co-Authors: Mitsuo Shoji, Mitsutaka Okumura, Yasutaka Kitagawa, Shusuke Yamanaka, Tomohiro Hamamoto, Kenichi Koizumi, Hiroshi Isobe, Yu Takano, Kizashi YamaguchiAbstract:Abstract The active site structure of hemerythrin are μ-(hydro)oxo bridged diiron cores and are universal in many non-hem proteins. The magnitudes of antiferroMagnetic Interactions in the binuclear iron center are largely different in each oxidization states. To clarify the Magnetic Interactions and electronic structures in oxy-hemerythrin(Hr), deoxy-Hr and met-Hr, hybrid density-functional theory were performed in the broken symmetry way. Effective-exchange Interactions are calculated by B2LYP method and they are in good agreement with experimental values. Natural orbital analyses are utilized to clarify their Magnetic Interactions between the iron spin sites. It is found that there are five Magnetic Interactions of σ, π1, π2, δ1, and δ2. Former three Interactions are stronger Interactions through μ-oxo. The latter two δ Interactions are weaker Interactions through carboxyl groups. Magnetic Interaction of π1 type is most significantly changed by dioxygen bonding, where the Magnetic Interaction pathway is through p orbital parallel to hydrogen atom of μ-hydroxo. At dioxygen bonding state of oxy-Hr, orbital Interactions between diiron spin sites and dioxygen are discussed.
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A theoretical study of electronic structures and intermolecular Magnetic Interactions for spiro-biphenalenyls
Polyhedron, 2005Co-Authors: Takeshi Taniguchi, Takashi Kawakami, Kizashi YamaguchiAbstract:Abstract In order to inquire into the mechanism of the change in the magnetism of spiro-biphenalnyls, intermolecular Magnetic Interaction has been investigated in terms of the effective exchange integral of the Heisenberg model for dimeric pairs of diethyl-substituted spiro-biphenalenyl. Variation of the Magnetic Interaction with respect to temperature has been evaluated for X-ray crystallographic structures at several temperature points by Kohn–Sham hybrid-DFT. The intermolecular Magnetic Interactions have been calculated for the π-dimers to be antiferroMagnetic at each temperature, which has decreased by approximately 30% in the magnitude from 100 to 173 K. In addition, the Interactions have been almost none at 100 and 173 K except for one pair and the remaining pair had ferroMagnetic Interaction. Therefore, it has been found that the change in their magnetism is understood by the formation of a ferroMagnetic dimer-pair at 173 K. Moreover, the natural orbital analysis for the electronic structure of diethyl-substituted spiro-biphenelenyl has shown our solutions are essentially identified to Haddon’s proposal in terms of the valence bond picture.
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Theoretical studies of Magnetic Interaction in π-radical thiol and Gold hybrid systems
Synthetic Metals, 2005Co-Authors: Mitsutaka Okumura, Yasutaka Kitagawa, Takashi Kawakami, Takeshi Taniguchi, Kizashi YamaguchiAbstract:Abstract Nanoscale Magnetic material is becoming an important topic in nanoscience and magnetism. Especially, gold nanoparticles chemisorbed by alkanethiols have drawn much attention due to the size effect on their electronic structure. However, Magnetic Interaction of gold nanoparticles derivatized by Magnetically active ligands has not been investigated in detail. In order to elucidate the Magnetic Interaction in gold nanoparticles chemisorbed by alkanethiol systems, small gold cluster and π-radical hybrid model systems were examined using the hybrid DFT method. In this research, the effective exchange integrals (J ab ) of model systems were calculated for qualitative understanding of the intramolecular Magnetic Interaction. From these calculations, it was found that there was a possibility of controlling the Magnetic Interaction of these hybrid model systems using electron/hole doping.
S Yu - One of the best experts on this subject based on the ideXlab platform.
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crystal growth and structure and Magnetic properties of the 5d oxide ca3lioso6 extended superexchange Magnetic Interaction in oxide
ChemInform, 2010Co-Authors: S Yu, Masao Arai, Akira Sato, Alexei A Belik, K Yamaura, Eiji TakayamamuromachiAbstract:Single crystals of the new title compound are prepared by a flux method from mixtures of Ca3OsO6 (obtained from stoichiometric amounts of CaO2 and Os, Pt capsule, 6 GPa, 1500 °C, 1 h), LiCl, and KCl in a mass ratio of 1:5:2 (Pt crucible, 750 °C, 12 h).
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crystal growth and structure and Magnetic properties of the 5d oxide ca3lioso6 extended superexchange Magnetic Interaction in oxide
Journal of the American Chemical Society, 2010Co-Authors: S Yu, Masao Arai, Akira Sato, Alexei A Belik, K Yamaura, Eiji TakayamamuromachiAbstract:Crystals of the newly synthesized compound Ca3LiOsO6 were grown by a flux method using LiCl and KCl, followed by single-crystal X-ray diffraction (XRD), low-temperature powder XRD, and measurements of ac and dc Magnetic susceptibility and specific heat. The data indicate that Ca3LiOsO6 has a fully opened electronic gap with an antiferroMagnetic ordered state, consistent with suggestions from the first-principles study. The observed Magnetic transition temperature is 117 K, too high to be caused only by a direct spin−spin Interaction. It appears that the original superexchange Magnetic path Os−O−Os is absent; thus, the extended superexchange path (Os−O)−(O−Os) can be expected to be responsible for the 117 K Magnetic order. If this is true, Ca3LiOsO6 would be highly valuable to study the nature of extended superexchange Magnetic Interactions in solids.
Roee Ozeri - One of the best experts on this subject based on the ideXlab platform.
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measurement of the Magnetic Interaction between two bound electrons of two separate ions
Nature, 2014Co-Authors: Shlomi Kotler, Nitzan Akerman, Nir Navon, Yinnon Glickman, Roee OzeriAbstract:The Magnetic Interaction between two electrons is measured at the micrometre scale, exhibiting spin entanglement generation over 15 seconds of coherent evolution; varying the inter-electron separation shows a distance dependence consistent with the inverse-cube law. Every electron carries an intrinsic Magnetic dipole moment, so any two electrons should therefore exert Magnetic forces on one another. The forces involved are very small, and at atomic scale Coulomb Interaction is dominant, so it is extremely difficult to observe the Magnetic Interaction. However, Shlomi Kotler et al. have now done just that, measuring the Interaction between two electrons, in separate trapped strontium-88 ions. The two electrons exhibit spin entanglement generation over 15 seconds of coherent evolution, and by varying inter-electron separation the authors demonstrate distance dependence that is consistent with the known inverse-cube law. Electrons have an intrinsic, indivisible, Magnetic dipole aligned with their internal angular momentum (spin). The Magnetic Interaction between two electronic spins can therefore impose a change in their orientation. Similar dipolar Magnetic Interactions exist between other spin systems and have been studied experimentally. Examples include the Interaction between an electron and its nucleus and the Interaction between several multi-electron spin complexes1,2,3,4,5. The challenge in observing such Interactions for two electrons is twofold. First, at the atomic scale, where the coupling is relatively large, it is often dominated by the much larger Coulomb exchange counterpart1. Second, on scales that are substantially larger than the atomic, the Magnetic coupling is very weak and can be well below the ambient Magnetic noise. Here we report the measurement of the Magnetic Interaction between the two ground-state spin-1/2 valence electrons of two 88Sr+ ions, co-trapped in an electric Paul trap. We varied the ion separation, d, between 2.18 and 2.76 micrometres and measured the electrons’ weak, millihertz-scale, Magnetic Interaction as a function of distance, in the presence of Magnetic noise that was six orders of magnitude larger than the Magnetic fields the electrons apply on each other. The cooperative spin dynamics was kept coherent for 15 seconds, during which spin entanglement was generated, as verified by a negative measured value of −0.16 for the swap entanglement witness. The sensitivity necessary for this measurement was provided by restricting the spin evolution to a decoherence-free subspace that is immune to collective Magnetic field noise. Our measurements show a d−3.0(4) distance dependence for the coupling, consistent with the inverse-cube law.
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Measurement of the Magnetic Interaction between two electrons
Bulletin of the American Physical Society, 2014Co-Authors: Shlomi Kotler, Nitzan Akerman, Nir Navon, Yinnon Glickman, Roee OzeriAbstract:Electrons have an intrinsic, indivisible, Magnetic dipole aligned with their internal angular momentum (spin)1. The Magnetic Interaction between two electrons can therefore impose a change in their spin orientation. Similar dipolar Magnetic Interactions exists between other spin systems and were studied experimentally. Examples include the Interaction between an electron and its nucleus or between several multi-electron spin complexes2–8. The process for two electrons, however, was never observed in experiment. The challenge is two-fold. At the atomic scale, where the coupling is relatively large, the Magnetic Interaction is often overshadowed by the much larger coulomb exchange counterpart2. In typical situations where exchange is negligible, Magnetic Interactions are also very weak and well below ambient Magnetic noise. Here we report on the first measurement of the Magnetic Interaction between two electronic spins. To this end, we used the ground state valence electrons of two Sr ions, co-trapped in an electric Paul trap and separated by more than two micrometers. We measured the weak, millihertz scale (alternatively 10−18 eV or 10−14 K), Magnetic Interaction between their electronic spins. This, in the presence of Magnetic noise that was six ∗Current address: Physical Measurement Laboratory, National Institute of Science and Technology, Boulder CO, 80305, USA. †Current address: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB30HE, United Kingdom.
