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Fully gapped d-wave superconductivity in CeCu2Si2.


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.

SUBMITTER: Pang G 

PROVIDER: S-EPMC6003525 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Fully gapped <i>d</i>-wave superconductivity in CeCu<sub>2</sub>Si<sub>2</sub>.

Pang Guiming G   Smidman Michael M   Zhang Jinglei J   Jiao Lin L   Weng Zongfa Z   Nica Emilian M EM   Chen Ye Y   Jiang Wenbing W   Zhang Yongjun Y   Xie Wu W   Jeevan Hirale S HS   Lee Hanoh H   Gegenwart Philipp P   Steglich Frank F   Si Qimiao Q   Yuan Huiqiu H  

Proceedings of the National Academy of Sciences of the United States of America 20180508 21


The nature of the pairing symmetry of the first heavy fermion superconductor CeCu<sub>2</sub>Si<sub>2</sub> has recently become the subject of controversy. While CeCu<sub>2</sub>Si<sub>2</sub> 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 beh  ...[more]

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