Signatures of valence fluctuations in CeCu2Si2 under high pressure

Details Signatures of valence fluctuations in CeCu2Si2 under high pressure Signatures of valence fluctuations in CeCu2Si2 under high pressure

2003-06-03

arxiv.org/abs/cond-mat/0306054v1

Phys. Rev. B 69, 024508 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.024508

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.

Affiliated with

Also associated with

No associations

Rating

Signatures of valence fluctuations in CeCu2Si2 under high pressure does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Signatures of valence fluctuations in CeCu2Si2 under high pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signatures of valence fluctuations in CeCu2Si2 under high pressure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-78607