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Signatures of valence fluctuations in CeCu2Si2 under high pressure | | A. T. Holmes
; D. Jaccard
; K. Miyake
; | | Date: |
3 Jun 2003 | | Journal: | Phys. Rev. B 69, 024508 (2004) DOI: 10.1103/PhysRevB.69.024508 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Affiliation: | University of Geneva, Switzerland, University of Osaka, Japan | | Abstract: | Simultaneous resistivity and a.c.-specific heat measurements have been performed under pressure on single crystalline CeCu2Si2 to over 6 GPa in a hydrostatic helium pressure medium. A series of anomalies were observed around the pressure coinciding with a maximum in the superconducting critical temperature, $T_c^{max}$. These anomalies can be linked with an abrupt change of the Ce valence, and suggest a second quantum critical point at a pressure $P_v simeq 4.5$ GPa, where critical valence fluctuations provide the superconducting pairing mechanism, as opposed to spin fluctuations at ambient pressure. Such a valence instability, and associated superconductivity, is predicted by an extended Anderson lattice model with Coulomb repulsion between the conduction and f-electrons. We explain the T-linear resistivity found at $P_v$ in this picture, while other anomalies found around $P_v$ can be qualitatively understood using the same model. | | Source: | arXiv, cond-mat/0306054 | | Services: | Forum | Review | PDF | Favorites | |
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