Revealing sign-reversal s+−-wave pairing by quasiparticle interference in the heavy-fermion superconductor CeCu2Si2
Shan Zhao, Bin Liu, Yi-feng Yang, Shiping Feng
DOI 10.1103/PhysRevB.105.014501 · Physical Review B
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Abstract
Recent observations of two nodeless gaps in superconducting CeCu2Si2 have raised intensive debates as to its exact gap structure of either sign-reversal (s+−) or sign-preserving (s++) pairing. Here, we investigate the quasiparticle interference (QPI) using realistic Fermi surface topology for both weak and strong interband impurity scatterings. Our calculations of the QPI and integrated antisymmetrized local density of states reveal qualitative distinctions between s+− and s++ pairing states, which include the intragap impurity resonance and a significant energy-dependence difference between two gap energies. Our predictions provide a guide for phase-sensitive QPI measurements to uncover decisively the true pairing symmetry in the heavy-fermion superconductor CeCu2Si2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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