1. Physical properties of a quasi-1D Ising S = ½ spin system: Ba4CoPt2O9+Δ
- Author
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B. Raveau, Olivier Perez, Vincent Caignaert, L. Hervé, Vincent Hardy, Nahed Sakly, Normandie Université (NU), and École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN)
- Subjects
010302 applied physics ,Physics ,[PHYS]Physics [physics] ,Spins ,Condensed matter physics ,Oxide ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials ,Coupling (physics) ,chemistry.chemical_compound ,chemistry ,Excited state ,0103 physical sciences ,Ising model ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,Anisotropy ,Spin-½ - Abstract
International audience; The spin chain oxide Ba 4 CoPt 2 O 9+Δ gathers several features that make it close to a 1D Ising S = 1/2 system: (i) it contains only one type of spins, which are associated to a Kramers doublet with a substantial gap from the first excited state; (ii) these spins exhibit a pronounced uniaxial anisotropy; (iii) their easy-axis is perfectly oriented along the spin chain direction; (iv) the spin chains remain uncoupled down to at least 2 K. It is reported that the magnetic susceptibility, the isothermal magnetization and the specific heat in fields up to 9 T can be well accounted for by the theoretical predictions for 1D Ising S = 1/2 systems, yielding consistent set of values for the Landé factors and the intrachain coupling. The presence of missing spins associated to the oxygen overstoichiometry is taken into account, as well as the polycrystalline nature of the samples which requires to consider angular averages of the anisotropic physical properties. more...
- Published
- 2020
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