Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 21, Pages 5343-5347Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1720291115
Keywords
heavy fermions; CeCu2Si2; multiband superconducting pairing; superconducting order parameter; penetration depth
Categories
Funding
- National Key R&D Program of China [2017YFA0303100, 2016YFA0300202]
- National Natural Science Foundation of China [U1632275, 1147425, 11604291]
- Science Challenge Project of China [TZ2016004]
- NSF [DMR-1611392, PHY-1607611]
- Robert A. Welch Foundation [C-1411]
- Institute for Complex Adaptive Matter (ICAM)
- Gordon and Betty Moore Foundation [GBMF5305]
- Center for Integrated Nanotechnologies
- US DOE Basic Energy Sciences (BES)
- Sino-German Cooperation Group on Emergent Correlated Materials [GZ1123]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1611392] Funding Source: National Science Foundation
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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.
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