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Fully gapped d-wave superconductivity in CeCu 2 Si 2

Fully gapped d-wave superconductivity in CeCu 2 Si 2

Guiming Pang, Michael Smidman, Jinglei Zhang, Lin Jiao, Zongfa Weng, Emilian M Nica, Ye Chen, Wenbing Jiang, Yongjun Zhang, Wu Xie, Hirale S Jeevan, Hanoh Lee, Philipp Gegenwart, Frank Steglich, Qimiao Si, etc.

Proc Natl Acad Sci U S A. 2018 May 22;115(21):5343-5347.

PMID: 29739886

Abstract:

The nature of the pairing symmetry of the first heavy fermion superconductor CeCu2Si2 has recently become the subject of controversy. While CeCu2Si2 was generally believed to be a d-wave superconductor, recent low-temperature specific heat measurements showed evidence for fully gapped superconductivity, contrary to the nodal behavior inferred from earlier results. Here, we report London penetration depth measurements, which also reveal fully gapped behavior at very low temperatures. To explain these seemingly conflicting results, we propose a fully gapped [Formula: see text] band-mixing pairing state for CeCu2Si2, which yields very good fits to both the superfluid density and specific heat, as well as accounting for a sign change of the superconducting order parameter, as previously concluded from inelastic neutron scattering results.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP380537359	SI-2		380537-35-9	Price

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