Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu${}_5$Rh${}_6$Sn${}_{18}$

Abstract

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 ($\mu$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 $\mu$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 $\mu$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.

arXiv comment5 pages, 5 figures, SUPPLEMENTAL MATERIAL. appears in Physical Review B: Rapid Communications (2015)

References in corpus (15)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Evidence for Time-Reversal-Symmetry-Broken Superconductivity in Locally Noncentrosymmetric SrPtAs
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
• Non-unitary triplet pairing in the centrosymmetric superconductor LaNiGa${}_2$
• Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
• Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs${}_4$Sb${}_{12}$
• Relativistic analysis of the pairing symmetry of the noncentrosymmetric superconductor LaNiC${}_2$
• Physical properties of noncentrosymmetric superconductor LaIrSi3: A μSR study
• Theory of Pairing Assisted Spin Polarization in Spin-Triplet Equal Spin Pairing: Origin of Extra Magnetization in Sr_2RuO_4 in Superconducting State
• Anomalous thermodynamic power laws near topological transitions in nodal superconductors

Cited by in corpus (38)

• Recent progress on superconductors with time-reversal symmetry breaking
• Searching for triplet superconductivity in the Quasi-One-Dimensional K2Cr3As3
• Two-gap superconductivity in LaNiGa${}_2$ with non-unitary triplet pairing and even parity gap symmetry
• Time Reversal Symmetry Breaking in noncentrosymmetric superconductor Re6Ti
• Superconducting and normal-state properties of the noncentrosymmetric superconductor Re6Zr
• Quantitative Theory of Triplet Pairing in the Unconventional Superconductor LaNiGa${}_2$
• Time-reversal-symmetry breaking and unconventional pairing in the noncentrosymmetric superconductor La${}_7$Rh${}_3$
• Nodal superconducting gap structure in the quasi-one-dimensional Cs${}_2$Cr${}_3$As${}_3$ investigated using $\mu$SR measurements
• Unconventional superconductivity in the cage type compound Sc${}_5$Rh${}_6$Sn${}_{18}$
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Multigap superconductivity in ThAsFeN investigated using muSR measurements
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Superconducting Properties and $\mu$SR Study of the Noncentrosymmetric Superconductor Nb${}_{0.5}$Os${}_{0.5}$
• Multigap Superconductivity in a charge density wave superconductor LaPt2Si2
• Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
• Investigations of the superconducting ground state of Zr${}_3$Ir: Introducing a new noncentrosymmetric superconductor
• Probing the superconducting ground state of ZrIrSi: A $\mu$SR study
• Time-reversal symmetry breaking in frustrated superconductor Re${}_2$Hf
• Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using muSR measurements
• Investigation of Superconducting Gap Structure in HfIrSi using muon spin relaxation/rotation
• Time-reversal symmetry breaking in superconductors through loop super-current order
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Two-band superconductivity with unconventional pairing symmetry in HfV${}_2$Ga${}_4$
• Nodeless superconductivity in Lu${}_{5-x}$Rh${}_6$Sn${}_{18+x}$ with broken time reversal symmetry
• Magnetically-textured superconductivity in elemental Rhenium
• Ir 5$d$-band Derived Superconductivity in LaIr${}_3$
• Probing the superconducting ground state of the rare-earth ternary boride superconductors $R$RuB${}_2$ ($R$ = Lu,Y) using muon-spin rotation and relaxation
• Nodeless superconductivity in the cage-type superconductor Sc5Ru6Sn18 with preserved time-reversal symmetry
• Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr${}_5$Pt${}_3$: A muon spin rotation and relaxation ($\mu$SR) study
• Pressure-enhanced superconductivity in cage-type quasiskutterudite Sc5Rh6Sn18 single crystal
• Quantum muon diffusion and the preservation of time-reversal symmetry in the superconducting state of type-I rhenium
• Time reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A $\mu$SR study
• Nodeless s-wave superconductivity in the α-Mn structure type noncentrosymmetric superconductor TaOs: A μSR study
• Time-reversal symmetry breaking in superconducting low-carrier-density quasi-skutterudite Lu3Os4Ge13
• Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc${}_5$Co${}_4$Si${}_{10}$ probed by muon-spin spectroscopy
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$
• Nodeless superconductivity in 4H${}_b$-TaS${}_2$ with broken time reversal symmetry
• Pressure induced superconducting dome in LaNiGa2