The Experts below are selected from a list of 17916 Experts worldwide ranked by ideXlab platform
D Kaczorowski - One of the best experts on this subject based on the ideXlab platform.
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Ferromagnetic Ordering in the novel ternary uranium germanide URu0.29Ge2
Intermetallics, 2018Co-Authors: Mathieu Pasturel, Adam Pikul, G. Chajewski, Henri Noël, D KaczorowskiAbstract:URu0.29Ge2 is a new germanide crystallizing in a monoclinic structure (C2/c space group, lattice parameters a = 4.098(1) angstrom, b = 15.936(3) angstrom, c = 4.045(1) angstrom and beta = 90.091(2)degrees) derived from the CeNiSi2-type. It undergoes a Ferromagnetic Ordering at T-c = 63 K, which manifests itself as distinct anomalies in temperature variations of the magnetization, specific heat and electrical resistivity. Just below T-c the T-dependent resistivity exhibits a broad hump, which hints at complex magnetic structure of the compound, while below 5 K it shows an upturn that likely arises due to atomic disorder in the crystal lattice.
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Ferromagnetic Ordering in single crystalline u2rhsi3 with fully ordered crystal structure
Journal of Alloys and Compounds, 2016Co-Authors: Maria Szlawska, M Majewicz, D KaczorowskiAbstract:Abstract A Czochralski-grown single crystal of U 2 RhSi 3 has been studied by means of x-ray diffraction, magnetization, electrical resistivity and heat capacity measurements. The phase was revealed to crystallize with a fully ordered crystal structure of the U 2 RuSi 3 -type. Our results implies long-range Ferromagnetic Ordering in the compound that sets in below T C = 24 K.
Mathieu Pasturel - One of the best experts on this subject based on the ideXlab platform.
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Ferromagnetic Ordering in the novel ternary uranium germanide URu0.29Ge2
Intermetallics, 2018Co-Authors: Mathieu Pasturel, Adam Pikul, G. Chajewski, Henri Noël, Dariusz KaczorowskiAbstract:Abstract URu 0.29 Ge 2 is a new germanide crystallizing in a monoclinic structure (C2/c space group, lattice parameters: a = 4.098(1) A, b = 15.936(3) A, c = 4.045(1) A and β = 90.091(2)°) derived from the CeNiSi 2 -type. It undergoes a Ferromagnetic Ordering at T C = 63 K, which manifests itself as distinct anomalies in temperature variations of the magnetization, specific heat and electrical resistivity. Just below T C , the T-dependent resistivity exhibits a broad hump, which hints at complex magnetic structure of the compound, while below 5 K it shows an upturn that likely arises due to atomic disorder in the crystal lattice.
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Ferromagnetic Ordering in the novel ternary uranium germanide URu0.29Ge2
Intermetallics, 2018Co-Authors: Mathieu Pasturel, Adam Pikul, G. Chajewski, Henri Noël, D KaczorowskiAbstract:URu0.29Ge2 is a new germanide crystallizing in a monoclinic structure (C2/c space group, lattice parameters a = 4.098(1) angstrom, b = 15.936(3) angstrom, c = 4.045(1) angstrom and beta = 90.091(2)degrees) derived from the CeNiSi2-type. It undergoes a Ferromagnetic Ordering at T-c = 63 K, which manifests itself as distinct anomalies in temperature variations of the magnetization, specific heat and electrical resistivity. Just below T-c the T-dependent resistivity exhibits a broad hump, which hints at complex magnetic structure of the compound, while below 5 K it shows an upturn that likely arises due to atomic disorder in the crystal lattice.
Sanping Chen - One of the best experts on this subject based on the ideXlab platform.
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a substituent effect of phenylacetic acid coligand perturbed structures and magnetic properties observed in two triple bridged azido cu ii chain compounds with Ferromagnetic Ordering and slow magnetic relaxation
Dalton Transactions, 2017Co-Authors: Xiangyu Liu, Peipei Cen, Quan Shi, Chengcheng Zhang, Weiming Song, Gang Xie, Sanping ChenAbstract:Based on two fluoro-substituted phenylacetate isomers, o-fluorophenylacetic acid (o-Hfpa) and p-fluorophenylacetic acid (p-Hfpa), two new Cu(II)-azido compounds, [Cu(o-fpa)(N3)(C2H5OH)]n (1) and [Cu(p-fpa)(N3)(C2H5OH)]n (2), have been prepared, and structurally and magnetically characterized. Single-crystal structure analyses indicate that compounds 1 and 2 consist of 1D chain-like coordination networks in which adjacent copper cations are linked by the alternating triple-bridges of μ-1,1-azido, syn,syn-carboxylate and μ2-ethanol. For the two title compounds, the diverse charge distributions on the carboxyl groups caused by distinct substituent effects of the two phenylacetate coligands lead to the different structural parameters of intrachain Cu–Cu distances (3.218 A for 1 and 3.168 A for 2) and Cu–N–Cu angles (106.82° for 1 and 104.81° for 2), further resulting in the disparity of magnetic behaviors. The dominant Ferromagnetic couplings between neighbouring Cu(II) ions in the two compounds (J = 87.08 cm−1 for 1, J = 66.05 cm−1 for 2) are due to the counter-complementarity of the multiple superexchange pathways, contributing to the interesting plots of a Ferromagnetic order (Tc = 11.0 K for 1, 9.5 K for 2) and slow magnetic relaxation that are rarely observed in most of the reported azido-Cu(II) architectures. Heat-capacity experiments further emphasize the characteristic long-range Ferromagnetic Ordering in compounds 1 and 2. Magneto-structural relationships of 1 and 2 are investigated as well. Moreover, DFT calculations (using different methods and basis sets) have been performed on both compounds to provide a qualitative and quantitative theoretical explanation of their magnetic behavior.
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coligand modifications fine tuned the structure and magnetic properties of two triple bridged azido cu ii chain compounds exhibiting Ferromagnetic Ordering and slow relaxation
Dalton Transactions, 2017Co-Authors: Xiangyu Liu, Peipei Cen, Shuchang Luo, Quan Shi, Chengcheng Zhang, Weiming Song, Gang Xie, Sanping ChenAbstract:Employing two benzoate derivatives with different numbers of non-coordinated fluoro-substituents, 2-fluorobenzoic acid (2-Hfba) and 2,6-difluorobenzoic acid (2,6-Hdfba), two new azido-copper coordination polymers, [Cu(2-fba)(N3)(CH3OH)]n (1) and [Cu(2,6-dfba)(N3)(CH3OH)]n (2), have been successfully isolated, and then structurally and magnetically investigated. Single crystal structure analysis demonstrates that the metal cations in the two resulting compounds are connected by the alternating triple-bridge of μ-1,1-azido, syn,syn-carboxylate and μ2-methanol, contributing to analogously linear 1D Cu(II) chain-like motifs with slightly different intrachain and interchain geometric parameters. The fine-tuned structures lead to variant magnetic properties in the two title compounds. Although a dominant Ferromagnetic coupling between adjacent Cu(II) ions within each chain due to the counter-complementarity of the multiple superexchange pathways is observed in both compounds, the interesting plots of magnetic Ordering and slow magnetic relaxation, which are rare in most of the reported azido-Cu(II) architectures, only occur in compound 1, while 2 behaves as an antiferromagnet consisting of Ferromagnetic Cu(II) chains. The heat-capacity experiments further emphasize the characteristic long-range Ferromagnetic Ordering in 1 and the typical behavior of antiferromagnets in 2. Moreover, density functional theory (DFT) calculations (using different methods and basis sets) have been performed on both compounds to obtain the qualitatively theoretical interpretation of the magnetic behaviors.
Peipei Cen - One of the best experts on this subject based on the ideXlab platform.
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a substituent effect of phenylacetic acid coligand perturbed structures and magnetic properties observed in two triple bridged azido cu ii chain compounds with Ferromagnetic Ordering and slow magnetic relaxation
Dalton Transactions, 2017Co-Authors: Xiangyu Liu, Peipei Cen, Quan Shi, Chengcheng Zhang, Weiming Song, Gang Xie, Sanping ChenAbstract:Based on two fluoro-substituted phenylacetate isomers, o-fluorophenylacetic acid (o-Hfpa) and p-fluorophenylacetic acid (p-Hfpa), two new Cu(II)-azido compounds, [Cu(o-fpa)(N3)(C2H5OH)]n (1) and [Cu(p-fpa)(N3)(C2H5OH)]n (2), have been prepared, and structurally and magnetically characterized. Single-crystal structure analyses indicate that compounds 1 and 2 consist of 1D chain-like coordination networks in which adjacent copper cations are linked by the alternating triple-bridges of μ-1,1-azido, syn,syn-carboxylate and μ2-ethanol. For the two title compounds, the diverse charge distributions on the carboxyl groups caused by distinct substituent effects of the two phenylacetate coligands lead to the different structural parameters of intrachain Cu–Cu distances (3.218 A for 1 and 3.168 A for 2) and Cu–N–Cu angles (106.82° for 1 and 104.81° for 2), further resulting in the disparity of magnetic behaviors. The dominant Ferromagnetic couplings between neighbouring Cu(II) ions in the two compounds (J = 87.08 cm−1 for 1, J = 66.05 cm−1 for 2) are due to the counter-complementarity of the multiple superexchange pathways, contributing to the interesting plots of a Ferromagnetic order (Tc = 11.0 K for 1, 9.5 K for 2) and slow magnetic relaxation that are rarely observed in most of the reported azido-Cu(II) architectures. Heat-capacity experiments further emphasize the characteristic long-range Ferromagnetic Ordering in compounds 1 and 2. Magneto-structural relationships of 1 and 2 are investigated as well. Moreover, DFT calculations (using different methods and basis sets) have been performed on both compounds to provide a qualitative and quantitative theoretical explanation of their magnetic behavior.
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coligand modifications fine tuned the structure and magnetic properties of two triple bridged azido cu ii chain compounds exhibiting Ferromagnetic Ordering and slow relaxation
Dalton Transactions, 2017Co-Authors: Xiangyu Liu, Peipei Cen, Shuchang Luo, Quan Shi, Chengcheng Zhang, Weiming Song, Gang Xie, Sanping ChenAbstract:Employing two benzoate derivatives with different numbers of non-coordinated fluoro-substituents, 2-fluorobenzoic acid (2-Hfba) and 2,6-difluorobenzoic acid (2,6-Hdfba), two new azido-copper coordination polymers, [Cu(2-fba)(N3)(CH3OH)]n (1) and [Cu(2,6-dfba)(N3)(CH3OH)]n (2), have been successfully isolated, and then structurally and magnetically investigated. Single crystal structure analysis demonstrates that the metal cations in the two resulting compounds are connected by the alternating triple-bridge of μ-1,1-azido, syn,syn-carboxylate and μ2-methanol, contributing to analogously linear 1D Cu(II) chain-like motifs with slightly different intrachain and interchain geometric parameters. The fine-tuned structures lead to variant magnetic properties in the two title compounds. Although a dominant Ferromagnetic coupling between adjacent Cu(II) ions within each chain due to the counter-complementarity of the multiple superexchange pathways is observed in both compounds, the interesting plots of magnetic Ordering and slow magnetic relaxation, which are rare in most of the reported azido-Cu(II) architectures, only occur in compound 1, while 2 behaves as an antiferromagnet consisting of Ferromagnetic Cu(II) chains. The heat-capacity experiments further emphasize the characteristic long-range Ferromagnetic Ordering in 1 and the typical behavior of antiferromagnets in 2. Moreover, density functional theory (DFT) calculations (using different methods and basis sets) have been performed on both compounds to obtain the qualitatively theoretical interpretation of the magnetic behaviors.
Dariusz Kaczorowski - One of the best experts on this subject based on the ideXlab platform.
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Ferromagnetic Ordering in the novel ternary uranium germanide URu0.29Ge2
Intermetallics, 2018Co-Authors: Mathieu Pasturel, Adam Pikul, G. Chajewski, Henri Noël, Dariusz KaczorowskiAbstract:Abstract URu 0.29 Ge 2 is a new germanide crystallizing in a monoclinic structure (C2/c space group, lattice parameters: a = 4.098(1) A, b = 15.936(3) A, c = 4.045(1) A and β = 90.091(2)°) derived from the CeNiSi 2 -type. It undergoes a Ferromagnetic Ordering at T C = 63 K, which manifests itself as distinct anomalies in temperature variations of the magnetization, specific heat and electrical resistivity. Just below T C , the T-dependent resistivity exhibits a broad hump, which hints at complex magnetic structure of the compound, while below 5 K it shows an upturn that likely arises due to atomic disorder in the crystal lattice.