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Simultaneous resistivity and a.c.-specific heat measurements have beenperformed under pressure on single crystalline CeCu2Si2 to over 6 GPa in ahydrostatic helium pressure medium. A series of anomalies were observed aroundthe pressure coinciding with a maximum in the superconducting criticaltemperature, $T_c^{max}$. These anomalies can be linked with an abrupt changeof the Ce valence, and suggest a second quantum critical point at a pressure$P_v \simeq 4.5$ GPa, where critical valence fluctuations provide thesuperconducting pairing mechanism, as opposed to spin fluctuations at ambientpressure. Such a valence instability, and associated superconductivity, ispredicted by an extended Anderson lattice model with Coulomb repulsion betweenthe 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 bequalitatively understood using the same model.Comment: Submitted to Phys. Rev.

physical review. b, condensed matter and materials physics

Signatures of valence fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>under high pressure

Signatures of valence fluctuations inCeCu2Si2under high pressure