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Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2

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arxiv 0911.0898 v1 pith:QVWJEORQ submitted 2009-11-04 cond-mat.str-el cond-mat.supr-con

Pressure-induced change of the pairing symmetry in superconducting CeCu2Si2

E. Lengyel , M. Nicklas , H. S. Jeevan , G. Sparn , C. Geibel , F. Steglich , Y. Yoshioka , K. Miyake This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords regionbeencecu2si2differentfluctuationspairingphaseregions
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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