Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2

Details Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2 Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2

2009-11-04

arxiv.org/abs/0911.0898v1

Phys. Rev. B 80, 140513(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.80.140513

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.

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