Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Lu</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi>Rh</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mn>18</mml:mn></mml:msub></mml:mrow></mml:math>

A. Bhattacharyya, D. T. Adroja, J. Quintanilla, A. D. Hillier, N. Kase, A. M. Strydom, J. Akimitsu

doi:10.48550/arxiv.1411.6877

The superconducting state of the caged type compound Lu$_5$Rh$_6$Sn$_{18}$ has been investigated by using magnetization, heat capacity, and muon-spin relaxation or rotation ($��$SR) measurements and the results interpreted on the basis of the group theoretical classifications of the possible pairing symmetries and a simple model of the resulting quasiparticle spectra. Our zero-field $��$SR measurements clearly reveal the spontaneous appearance of an internal magnetic field below the transition temperature, which indicates that the superconducting state in this material is characterized by the broken time-reversal symmetry. Further the analysis of temperature dependence of the magnetic penetration depth measured using the transverse field $��$SR measurements suggest an isotropic $s$-wave character for the superconducting gap. This is in agreement with the heat capacity behavior and we show that it can be interpreted in terms of a non unitary triplet state with point nodes and an open Fermi surface.

5 pages, 5 figures, SUPPLEMENTAL MATERIAL. appears in Physical Review B: Rapid Communications (2015)

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