1. The crystal-field states and the magnetism in the Kondo-lattice antiferromagnet CeRh2Si2
- Author
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D. M. Nalecz, R. J. Radwanski, and Z. Ropka
- Subjects
Physics ,Condensed matter physics ,Magnetic moment ,Magnetism ,02 engineering and technology ,Actinide ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Ion ,Paramagnetism ,Antiferromagnetism ,General Materials Science ,0210 nano-technology ,Ground state ,Quantum - Abstract
We have theoretically analysed temperature dependence of the specific heat at temperatures below 50 K of a Kondo-lattice antiferromagnet CeRh 2 Si 2 . We have reproduced experimentally-observed λ -type peak at the magnetic-ordering temperature T N of 36.5 K as originating from the splitting of the Kramers-doublet ground state of the Ce 3 + ion. We have derived a set of crystal-field parameters, which, apart of the reproduction of crystal-field excitations of 30 and 52 meV, of the temperature dependence of the specific heat and of the paramagnetic susceptibility, reproduces a value of the magnetic moment, of 1.60 μ B . Our results for the temperature dependence of the specific heat and of the entropy are physically adequate and substantially improved compared to theoretical descriptions reported in a recent publication in Nature Comm. (7 (2016) 11029). A good reproduction of the physical magnetic and electronic properties indicates that 99 ± 1 % of Ce ions are in the 4 f 1 configuration. A large value of the entropy removed in the magnetic transition, very close to Rln2, indicates that the hybridization effects and a broadening of crystal-field states in CeRh 2 Si 2 are very small. The Quantum Atomistic Solid-State Theory (QUASST) approach can be used for the theoretical description of magnetic and electronic properties of other Ce, rare-earth and actinides compounds. more...
- Published
- 2019
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