Incommensurate and commensurate magnetic structures of the ternary germanide CeNiGe3
| Autor: | Laurence Durivault, François Weill, Bernard Chevalier, José Gabriel Rodrigo, Sebastian Vieira, P. Martinez-Samper, Gilles André, Françoise Bourée, Hermann Suderow, Jean Etourneau |
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| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Facultad de Ciencas [Madrid], Universidad Autónoma de Madrid (UAM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Universidad Autonoma de Madrid (UAM) |
| Rok vydání: | 2002 |
| Předmět: |
Electric resistance
Heat capacity Neutron diffraction 02 engineering and technology Magnetization 01 natural sciences Magnetic moment chemistry.chemical_compound Magnetic transition 0103 physical sciences Antiferromagnetism General Materials Science 010306 general physics Condensed matter physics Magnetic structure Crystal structure Magnetic spin glasses Antiferromagnetic ordering [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Germanide chemistry Electron diffraction 0210 nano-technology Ternary operation |
| Zdroj: | Journal of Physics: Condensed Matter Journal of Physics: Condensed Matter, 2003, 15 (2), pp.77-90. ⟨10.1088/0953-8984/15/2/308⟩ Journal of Physics: Condensed Matter, IOP Publishing, 2003, 15 (2), pp.77-90. ⟨10.1088/0953-8984/15/2/308⟩ |
| ISSN: | 0953-8984 1361-648X |
| Popis: | International audience; The structural properties of CeNiGe3 have been investigated via electron diffraction and neutron powder diffraction (NPD). This ternary germanide crystallizes in the orthorhombic SmNiGe3-type structure (Cmmm space group). Electrical resistivity, ac- and dc-magnetization measurements show that CeNiGe3 orders antiferromagnetically below TN = 5.5(2) K and exclude the occurrence at low temperatures of a spin-glass state for CeNiGe3 as previously reported. Specific heat measurements and NPD both reveal two magnetic transitions, observed at TN1 = 5.9(2) K and TN2 = 5.0(2) K. Between TN1 and TN2, the Ce magnetic moments in CeNiGe3 are ordered in a collinear antiferromagnetic structure associated with the k1 = (100) wavevector and showing a relationship with the magnetic structure of the Ce3Ni2Ge7 ternary germanide. Below TN2, this k1 = (100) commensurate magnetic structure coexists with an incommensurate helicoîdal magnetic structure associated with k2 = (00.409(1)1/2). This last magnetic structure is highly preponderant below TN2 (93(5)% in volume). At 1.5 K, the Ce atoms in CeNiGe3 carry a reduced ordered magnetic moment (0.8(2) μB). This value, smaller than that obtained in Ce3Ni2Ge7, results from an important hybridization of the 4f(Ce) orbitals with those of the Ni and Ge ligands. |
| Databáze: | OpenAIRE |
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