Author:
Pang Guiming,Smidman Michael,Zhang Jinglei,Jiao Lin,Weng Zongfa,Nica Emilian M.,Chen Ye,Jiang Wenbing,Zhang Yongjun,Xie Wu,Jeevan Hirale S.,Lee Hanoh,Gegenwart Philipp,Steglich Frank,Si Qimiao,Yuan Huiqiu
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 d+d 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.
Funder
National Key R&D Program of China
National Natural Science Foundation of China
Science Challenge Project of China
NSF
Robert A. Welch Foundation
Publisher
Proceedings of the National Academy of Sciences
Cited by
62 articles.
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