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Romero, M.A.; Aligia, A.A.; Sereni, J.G.; Nieva, G. |
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Title |
Interpretation of experimental results on Kondo systems with crystal field |
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Journal Article |
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2014 |
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Journal of Physics: Condensed Matter |
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J. Phys. : Condens. Matter |
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26 |
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025602 |
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cond-mat.str-el |
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Abstract |
We present a simple approach to calculate the thermodynamic properties of single Kondo impurities including orbital degeneracy and crystal field effects (CFE) by extending a previous proposal by K. D. Schotte and U. Schotte [Physics Lett. A 55, 38 (1975)]. Comparison with exact solutions for the specific heat of a quartet ground state split into two doublets shows deviations below $10\%$ in absence of CFE and a quantitative agreement for moderate or large CFE. As an application, we fit the measured specific heat of the compounds CeCu$2$Ge$2$, CePd${3}$Si${0.3}$, CePdAl, CePt, Yb$2$Pd$2$Sn and YbCo$2$Zn${20}$. The agreement between theory and experiment is very good or excellent depending on the compound, except at very low temperatures due to the presence of magnetic correlations (not accounted in the model). |
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arXiv:1308.3256v3; Journal Ref: J. Phys.: Condens. Matter 26 (2014) 025602 (9pp) |
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BT @ berisso @ |
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675 |
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Author |
Sereni, J.G. |
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Title |
First observation of Ce volume collapse in CeN |
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Manuscript |
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2017 |
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arXiv |
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arXiv |
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1712.10036 |
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cond-mat.str-el |
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On the occasion of the 80th anniversary of the first observation of Ce volume collapse in CeN a remembrance of the implications of that transcendent event is presented, along with a review of the knowledge of Ce physical properties available at that time. Coincident anniversary corresponds to the first proposal for Ce as a mix valence element, motivating to briefly review how the valence instability of Ce was investigated since that time. |
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arXiv:1712.10036v1; This review was presented in a plenary session at the SCES 2017 conference, Prague, 17 July 2017 |
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781 |
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