The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
Klaus H. Ploog - One of the best experts on this subject based on the ideXlab platform.
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Investigation of MBE-grown high Tc films by RHEED, atomic force microscopy and X-Ray diffraction
Journal of Crystal Growth, 1993Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Results on the preparation of the molecular beam epitaxial (MBE) growth and on structural investigations of high T c DyBa 2 Cu 3 O 7- y (DBCO) superconducting thin films are presented. We prepared high quality DBCO thin films on SrTiO 3 , MgO, LaAlO 3 and NdGaO 3 substrates in situ with high reproductivity. We also grew DBCO/Dy 2 O 3 /DBCO/SrTiO 3 multilayer structures. The structure and morphology of the films were studied by RHEED, STM, AFM, XRD and X-Ray Weissenberg camera techniques.
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DyBa2Cu3O7-y superconducting thin films with (103) and (013) orientations grown on (001) MgO by molecular beam epitaxy
Solid State Communications, 1992Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Superconducting DyBa2Cu3O7-y thin films with (103) and (013) orientations have been grown in situ on MgO (001) substrates by molecular beam epitaxy (MBE). The orientations were identified by Bragg-Brentano X-Ray diffraction combined with X-Ray Weissenberg-camera techniques. The nucleation and growth mechanism is discussed in terms of a simple model based on charge-neutrality considerations.
C. Coulon - One of the best experts on this subject based on the ideXlab platform.
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Dramatic anion size effect on structural and magnetic properties within a series of novel antiferromagnetic organometallic radical cation salts: [ Cp
EDP Sciences, 1999Co-Authors: R. Clérac, M. Fourmigué, J. Gaultier, Y. Barrans, P.a. Albouy, C. CoulonAbstract:Electrocrystallization of CH2Cl2 solutions of Cp2Mo(dmit), dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, in the presence of n-Bu4NX (X- = PF$_6^-$, AsF$_6^-$, SbF$_6^-$) affords the corresponding 1:1 cation radical salts [ Cp2Mo(dmit)$^{+\bullet}$] [ X-] . The three isostructural salts crystallize in the orthorhombic system, space group Cmcm. In the three salts, a second-order transition at a temperature T1, identified by EPR measurements and low-temperature X-Ray Weissenberg photographs reveals also a splitting of some principal reflections and the twinned character of the crystals, whose room temperature structure may also be described in the monoclinic P21/m space group. The second order monoclinic $\rightarrow$ triclinic transition is associated with the apparition of a superlattice characterized by the critical wave vector ${\bf q}_1^{*}=(0,1/2,1/2)$ when expressed in the monoclinic system. A second transition at a lower temperature T2, of first order character, is observed only in the PF$_6^-$ salt. This triclinic $\rightarrow$ triclinic transition leads to a novel superlattice of wave vector ${\bf q}_2=(0,1/2,0)$ while the ${\bf q}_1^{*}$ superlattice is conserved down to 10 K in the AsF$_6^-$ and SbF$_6^-$ salts. Finally, a third transition to an antiferromagnetic ground state is observed for the three salts and investigated by static susceptibility measurements and Antiferromagnetic Resonance (AFMR) experiments. The detailed analysis of the AFMR rotation patterns confirms the twinned nature and the low temperature triclinic symmetry of the crystals as well as the peculiar behaviour of the PF$_6^-$ salt, when compared with the two other members of these novel series
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Dramatic anion size effect on structural and magnetic properties within a series of novel antiferromagnetic organometallic radical cation salts: [Cp Mo(dmit) ][X
The European Physical Journal B - Condensed Matter and Complex Systems, 1999Co-Authors: R. Clérac, M. Fourmigué, J. Gaultier, Y. Barrans, P.a. Albouy, C. CoulonAbstract:Electrocrystallization of CH_2Cl_2 solutions of Cp_2Mo(dmit), dmit^2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, in the presence of n -Bu_4NX (X^- = PF_ 6 ^ - , AsF_ 6 ^ - , SbF_ 6 ^ - ) affords the corresponding 1:1 cation radical salts [Cp_2Mo(dmit) ][X^-]. The three isostructural salts crystallize in the orthorhombic system, space group Cmcm. In the three salts, a second-order transition at a temperature T_1, identified by EPR measurements and low-temperature X-Ray Weissenberg photographs reveals also a splitting of some principal reflections and the twinned character of the crystals, whose room temperature structure may also be described in the monoclinic P2_1/m space group. The second order monoclinic triclinic transition is associated with the apparition of a superlattice characterized by the critical wave vector when expressed in the monoclinic system. A second transition at a lower temperature T_2, of first order character, is observed only in the PF_ 6 ^ - salt. This triclinic triclinic transition leads to a novel superlattice of wave vector while the superlattice is conserved down to 10 K in the AsF_ 6 ^ - and SbF_ 6 ^ - salts. Finally, a third transition to an antiferromagnetic ground state is observed for the three salts and investigated by static susceptibility measurements and Antiferromagnetic Resonance (AFMR) experiments. The detailed analysis of the AFMR rotation patterns confirms the twinned nature and the low temperature triclinic symmetry of the crystals as well as the peculiar behaviour of the PF_ 6 ^ - salt, when compared with the two other members of these novel series.
H.s. Wang - One of the best experts on this subject based on the ideXlab platform.
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Investigation of MBE-grown high Tc films by RHEED, atomic force microscopy and X-Ray diffraction
Journal of Crystal Growth, 1993Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Results on the preparation of the molecular beam epitaxial (MBE) growth and on structural investigations of high T c DyBa 2 Cu 3 O 7- y (DBCO) superconducting thin films are presented. We prepared high quality DBCO thin films on SrTiO 3 , MgO, LaAlO 3 and NdGaO 3 substrates in situ with high reproductivity. We also grew DBCO/Dy 2 O 3 /DBCO/SrTiO 3 multilayer structures. The structure and morphology of the films were studied by RHEED, STM, AFM, XRD and X-Ray Weissenberg camera techniques.
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DyBa2Cu3O7-y superconducting thin films with (103) and (013) orientations grown on (001) MgO by molecular beam epitaxy
Solid State Communications, 1992Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Superconducting DyBa2Cu3O7-y thin films with (103) and (013) orientations have been grown in situ on MgO (001) substrates by molecular beam epitaxy (MBE). The orientations were identified by Bragg-Brentano X-Ray diffraction combined with X-Ray Weissenberg-camera techniques. The nucleation and growth mechanism is discussed in terms of a simple model based on charge-neutrality considerations.
R. Clérac - One of the best experts on this subject based on the ideXlab platform.
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Dramatic anion size effect on structural and magnetic properties within a series of novel antiferromagnetic organometallic radical cation salts: [ Cp
EDP Sciences, 1999Co-Authors: R. Clérac, M. Fourmigué, J. Gaultier, Y. Barrans, P.a. Albouy, C. CoulonAbstract:Electrocrystallization of CH2Cl2 solutions of Cp2Mo(dmit), dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, in the presence of n-Bu4NX (X- = PF$_6^-$, AsF$_6^-$, SbF$_6^-$) affords the corresponding 1:1 cation radical salts [ Cp2Mo(dmit)$^{+\bullet}$] [ X-] . The three isostructural salts crystallize in the orthorhombic system, space group Cmcm. In the three salts, a second-order transition at a temperature T1, identified by EPR measurements and low-temperature X-Ray Weissenberg photographs reveals also a splitting of some principal reflections and the twinned character of the crystals, whose room temperature structure may also be described in the monoclinic P21/m space group. The second order monoclinic $\rightarrow$ triclinic transition is associated with the apparition of a superlattice characterized by the critical wave vector ${\bf q}_1^{*}=(0,1/2,1/2)$ when expressed in the monoclinic system. A second transition at a lower temperature T2, of first order character, is observed only in the PF$_6^-$ salt. This triclinic $\rightarrow$ triclinic transition leads to a novel superlattice of wave vector ${\bf q}_2=(0,1/2,0)$ while the ${\bf q}_1^{*}$ superlattice is conserved down to 10 K in the AsF$_6^-$ and SbF$_6^-$ salts. Finally, a third transition to an antiferromagnetic ground state is observed for the three salts and investigated by static susceptibility measurements and Antiferromagnetic Resonance (AFMR) experiments. The detailed analysis of the AFMR rotation patterns confirms the twinned nature and the low temperature triclinic symmetry of the crystals as well as the peculiar behaviour of the PF$_6^-$ salt, when compared with the two other members of these novel series
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Dramatic anion size effect on structural and magnetic properties within a series of novel antiferromagnetic organometallic radical cation salts: [Cp Mo(dmit) ][X
The European Physical Journal B - Condensed Matter and Complex Systems, 1999Co-Authors: R. Clérac, M. Fourmigué, J. Gaultier, Y. Barrans, P.a. Albouy, C. CoulonAbstract:Electrocrystallization of CH_2Cl_2 solutions of Cp_2Mo(dmit), dmit^2- = 2-thioxo-1,3-dithiole-4,5-dithiolate, in the presence of n -Bu_4NX (X^- = PF_ 6 ^ - , AsF_ 6 ^ - , SbF_ 6 ^ - ) affords the corresponding 1:1 cation radical salts [Cp_2Mo(dmit) ][X^-]. The three isostructural salts crystallize in the orthorhombic system, space group Cmcm. In the three salts, a second-order transition at a temperature T_1, identified by EPR measurements and low-temperature X-Ray Weissenberg photographs reveals also a splitting of some principal reflections and the twinned character of the crystals, whose room temperature structure may also be described in the monoclinic P2_1/m space group. The second order monoclinic triclinic transition is associated with the apparition of a superlattice characterized by the critical wave vector when expressed in the monoclinic system. A second transition at a lower temperature T_2, of first order character, is observed only in the PF_ 6 ^ - salt. This triclinic triclinic transition leads to a novel superlattice of wave vector while the superlattice is conserved down to 10 K in the AsF_ 6 ^ - and SbF_ 6 ^ - salts. Finally, a third transition to an antiferromagnetic ground state is observed for the three salts and investigated by static susceptibility measurements and Antiferromagnetic Resonance (AFMR) experiments. The detailed analysis of the AFMR rotation patterns confirms the twinned nature and the low temperature triclinic symmetry of the crystals as well as the peculiar behaviour of the PF_ 6 ^ - salt, when compared with the two other members of these novel series.
D. Eissler - One of the best experts on this subject based on the ideXlab platform.
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Investigation of MBE-grown high Tc films by RHEED, atomic force microscopy and X-Ray diffraction
Journal of Crystal Growth, 1993Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Results on the preparation of the molecular beam epitaxial (MBE) growth and on structural investigations of high T c DyBa 2 Cu 3 O 7- y (DBCO) superconducting thin films are presented. We prepared high quality DBCO thin films on SrTiO 3 , MgO, LaAlO 3 and NdGaO 3 substrates in situ with high reproductivity. We also grew DBCO/Dy 2 O 3 /DBCO/SrTiO 3 multilayer structures. The structure and morphology of the films were studied by RHEED, STM, AFM, XRD and X-Ray Weissenberg camera techniques.
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DyBa2Cu3O7-y superconducting thin films with (103) and (013) orientations grown on (001) MgO by molecular beam epitaxy
Solid State Communications, 1992Co-Authors: H.s. Wang, D. Eissler, Werner Dietsche, Albrecht Fischer, Klaus H. PloogAbstract:Abstract Superconducting DyBa2Cu3O7-y thin films with (103) and (013) orientations have been grown in situ on MgO (001) substrates by molecular beam epitaxy (MBE). The orientations were identified by Bragg-Brentano X-Ray diffraction combined with X-Ray Weissenberg-camera techniques. The nucleation and growth mechanism is discussed in terms of a simple model based on charge-neutrality considerations.
