Signatures of valence fluctuations in CeCu2Si2 under high pressure

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dc.creatorHolmes, A. T.
dc.creatorJaccard, D.
dc.creatorMiyake, K.
dc.date2003-06-03
dc.date.accessioned2026-07-07T06:19:45Z
dc.date.available2026-07-07T06:19:45Z
dc.descriptionSimultaneous 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.
dc.descriptionSubmitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0306054
dc.identifierhttp://arxiv.org/abs/cond-mat/0306054
dc.identifierPhys. Rev. B 69, 024508 (2004)
dc.identifierdoi:10.1103/PhysRevB.69.024508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/95133
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleSignatures of valence fluctuations in CeCu2Si2 under high pressure
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