Symmetry of order parameters in multiband superconductors LaRu$_4$As$_{12}$ and PrOs$_4$Sb$_{12}$ probed by local magnetization measurements - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2020

Symmetry of order parameters in multiband superconductors LaRu$_4$As$_{12}$ and PrOs$_4$Sb$_{12}$ probed by local magnetization measurements

Résumé

The temperature dependencies of the lower critical field Hc1ðTÞ of several filled-skutterudite superconductors were investigated by local magnetization measurements. While LaOs4As12 and PrRu4As12 exhibit the Hc1ðTÞ dependencies consistent with the single-band BCS prediction, for LaRu4As12 (the superconducting temperature Tc ¼ 10.4 K) with a similar three-dimensional Fermi surface, we observe a sudden increase in Hc1ðTÞ deep in a superconducting state below about 0.32Tc. Remarkably, a rapid rise of Hc1ðTÞ at approximately the same reduced temperature 0.27Tc is also found for the heavy-fermion compound PrOs4Sb12 (Tc ≃ 1.78 K), in fair accord with the earlier macroscopic study. We attribute the unusual Hc1ðTÞ dependencies of LaRu4As12 and PrOs4Sb12 to a kink structure in their superfluid densities due to different contributions from two nearly decoupled bands. Whereas LaRu4As12 is established as a two-band isotropic s-wave superconductor, nonsaturating behavior of Hc1ðTÞis observed for PrOs4Sb12, indicative of an anisotropic structure of a smaller gap. For this superconductor with broken time-reversal symmetry, our findings suggest a superconducting state with multiple symmetries of the order parameters.
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Dates et versions

hal-03800095 , version 1 (06-10-2022)

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J. Juraszek, R. Wawryk, Z. Henkie, M. Konczykowski, T. Cichorek. Symmetry of order parameters in multiband superconductors LaRu$_4$As$_{12}$ and PrOs$_4$Sb$_{12}$ probed by local magnetization measurements. Physical Review Letters, 2020, 124, pp.027001. ⟨10.1103/PhysRevLett.124.027001⟩. ⟨hal-03800095⟩
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