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Physical properties of a quasi-1D Ising S = ½ spin system: Ba4CoPt2O9+Δ

Physical properties of a quasi-1D Ising S = ½ spin system: Ba4CoPt2O9+Δ

Authors :
B. Raveau
Olivier Perez
Vincent Caignaert
L. Hervé
Vincent Hardy
Nahed Sakly
Normandie Université (NU)
École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN)
Source :
Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, Elsevier, 2020, ⟨10.1016/j.jmmm.2020.166877⟩
Publication Year :
2020
Publisher :
HAL CCSD, 2020.

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.

Details

Language :
English
ISSN :
03048853
Database :
OpenAIRE
Journal :
Journal of Magnetism and Magnetic Materials, Journal of Magnetism and Magnetic Materials, Elsevier, 2020, ⟨10.1016/j.jmmm.2020.166877⟩
Accession number :
edsair.doi.dedup.....3b7b2ea31c0d7b2822f03c45b9534042
Full Text :
https://doi.org/10.1016/j.jmmm.2020.166877⟩