Valence fluctuation-mediated superconductivity in CeCu2Si2

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  • University of Geneva
  • Osaka University


It has been proposed that there are two types of superconductivity in CeCu2Si2, mediated by spin fluctuations at ambient pressure, and by critical valence fluctuations around a charge instability at a pressure P ≃ 4.5 GPa. We present in detail some of the unusual features of this novel type of superconducting state, including the coexistence of superconductivity and huge residual resistivity of the order of the Ioffe-Regel limit, large and pressure-dependent resistive transition widths in a single-crystal measured under hydrostatic conditions, asymmetric pressure dependence of the specific heat jump shape, unrelated to the resistivity width, and negative temperature dependence of the normal state resistivity below 10 K at very high pressure.


Original languageEnglish
Pages (from-to)339-342
Number of pages4
JournalPhysica B - Physics of Condensed Matter
Issue numberSPEC. ISS.
Publication statusPublished - 1 May 2006

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