Conventional s-wave Superconductivity in LaRh2As2; the Analog without the 4f Electrons of CeRh2As2
Abstract
Superconductor LaRh2As2 has the same crystal structures as CeRh2As2, which exhibits superconducting (SC) multiphase in the c-axis magnetic field. Although the SC transition temperatures Tc are similar, around 0.3 K, LaRh2As2 shows conventional type-II superconductivity with a small upper critical field Hc2 10 mT. At present, the SC properties of LaRh2As2 have not been clarified yet. We performed 75As-nuclear quadrupole resonance (NQR) measurements on LaRh2As2 to investigate the SC properties and gap structure. 1/T1 shows a clear coherence peak just below Tc and an exponential decrease at lower temperatures, suggesting full-gap s-wave superconductivity. The numerical calculations based on an s-wave SC model reveal an SC gap size of (0)/kBTc 1.48, consistent with the weak-coupling s-wave superconductivity. These results suggest that the 4f electrons in CeRh2As2 not only enhance the orbital limiting field but also contribute to the formation of unconventional superconductivity with SC multiphase.
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