Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2

Abstract

Low-temperature (T) heat-capacity measurements under hydrostatic pressure of up to p=2.1 GPa have been performed on single-crystalline CeCu2Si2. A broad superconducting (SC) region exists in the T-p phase diagram. In the low-pressure region antiferromagnetic spin fluctuations and in the high-pressure region valence fluctuations had previously been proposed to mediate Cooper pairing. We could identify these two distinct SC regions. We found different thermodynamic properties of the SC phase in both regions, supporting the proposal that different mechanisms might be implied in the formation of superconductivity.

4 pages, 5 figures

References in corpus (1)

• Signatures of valence fluctuations in CeCu2Si2 under high pressure

Cited by in corpus (5)

• Roles of Critical Valence Fluctuations in Ce- and Yb-Based Heavy Fermion Metals
• Superconductivity in Ce- and U-based "122" heavy-fermion compounds
• Pressure Tuning of the Interplay of Magnetism and Superconductivity in CeCu2Si2
• Quantum criticality and first-order transitions in the extended periodic Anderson model
• High pressure investigation of superconducting signatures in CeCu${}_2$Si${}_2$ : ac- magnetic susceptibility and heat capacity, resistivity and thermopower