Time-reversal symmetry breaking in superconducting low-carrier-density quasi-skutterudite Lu3Os4Ge13

Abstract

The complex structure of the Remeika phases, the intriguing quantum states they display, and their low carrier concentrations are a strong motivation to study the nature of their superconducting phases. In this work, the microscopic properties of the superconducting phase of single-crystalline Lu${}_3$Os${}_4$Ge${}_{13}$ are investigated by muon-spin relaxation and rotation ($\mu$SR) measurements. The zero-field $\mu$SR data reveal the presence of spontaneous static or quasi-static magnetic fields in the superconducting state, breaking time-reversal symmetry; the associated internal magnetic field scale is found to be exceptionally large ($\approx$ 0.18~mT). Furthermore, transverse-field $\mu$SR measurements in the vortex state of Lu${}_3$Os${}_4$Ge${}_{13}$ imply a complex gap function with significantly different strengths on different parts of the Fermi surface. While our measurements do not completely determine the order parameter, they strongly indicate that electron-electron interactions are essential to stabilizing pairing in the system, thus, demonstrating its unconventional nature.

arXiv comment7 pages, 2 figures

References in corpus (41)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Magnetic Penetration Depth in Unconventional Superconductors
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• 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
• s+is State with Broken Time Reversal Symmetry in Fe-Based Superconductors
• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• Pressure-induced and Composition-induced Structural Quantum Phase Transition in the Cubic Superconductor (Sr/Ca)_3Ir_4Sn_{13}
• Elaboration of the alpha-Model Derived from the BCS Theory of Superconductivity
• Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
• Muon-spin rotation studies of SmFeAsO_0.85 and NdFeAsO_0.85 superconductors
• Emerging superconductivity with broken time reversal symmetry inside a superconducting $s$-wave state
• Ambient Pressure Structural Quantum Critical Point in the Phase Diagram of (Ca${}_x$Sr${}_{1-x}$)${}_3$Rh${}_4$Sn${}_{13}$
• Domain walls and their experimental signatures in s+is superconductors
• Time-reversal symmetry breaking in noncentrosymmetric superconductor Re6Hf:further evidence for unconventional behaviour in the alpha-Mn family of materials
• Comparison of different methods for analyzing $\mu$SR line shapes in the vortex state of type-II superconductors
• Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu${}_5$Rh${}_6$Sn${}_{18}$
• Strong Coupling Superconductivity in the Vicinity of the Structural Quantum Critical Point in (Ca${}_x$Sr${}_{1-x}$)${}_3$Rh${}_4$Sn${}_{13}$
• Time-reversal-symmetry breaking and unconventional pairing in the noncentrosymmetric superconductor La${}_7$Rh${}_3$
• Nodeless superconductivity in Ca3Ir4Sn13: evidence from quasiparticle heat transport
• Unconventional superconductivity in the cage type compound Sc${}_5$Rh${}_6$Sn${}_{18}$
• Suppression of time reversal symmetry breaking superconductivity in Pr(Os,Ru)_4Sb_12 and (Pr,La)Os_4Sb_12
• Microscopic studies of the normal and superconducting state of Ca3Ir4Sn13
• Superconducting and magnetic properties of Sr3Ir4Sn13
• Strong enhancement of conventional superconductivity near a quantum critical point of (Ca,Sr)_3Ir_4Sn_13
• Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor La${}_7$Ni${}_3$
• Ferromagnetic ordering of minority Ce${}^{3+}$ spins in a quasi-skutterudite Ce${}_3$Os${}_4$Ge${}_{13}$ single crystal
• Broken Time Reversal Symmetry in Superconducting Pr1-xCexPt4Ge12
• Two-gap superconductivity in Lu${}_2$Fe${}_3$Si${}_5$: a transverse-field muon spin rotation study
• Broken time-reversal symmetry in superconducting Pr${}_{1-x}$La${}_x$Pt${}_4$Ge${}_{12}$
• Time-reversal symmetry breaking in frustrated superconductor Re${}_2$Hf
• Kondo effect in a novel 5d quasi-skutterudite Yb3Os4Ge13
• {Multiband Superconductivity in Lu${}_3$Os${}_4$Ge${}_{13}$
• Evidence for the coexistence of time-reversal symmetry breaking and Bardeen-Cooper-Schrieffer-like superconductivity in La${}_7$Pd${}_3$
• Possible unconventional pairing in $(\text{Ca,Sr}{)}_3(\text{Ir,Rh}{)}_4{\text{Sn}}_{13}$ superconductors revealed by controlling disorder
• Nodeless superconductivity and the peak effect in the quasi-skutterudites ${\mathrm{Lu}}_3{\mathrm{Os}}_4{\mathrm{Ge}}_{13}$ and ${\mathrm{Y}}_3{\mathrm{Ru}}_4{\mathrm{Ge}}_{13}$
• Time-reversal-symmetry Breaking in the Superconducting State of ScS
• Complex Transport and Magnetism in Inhomogeneous Mixed Valence Ce${}_3$Ir${}_4$Ge${}_{13}$
• Odd-frequency pairing and time-reversal symmetry breaking for repulsive interactions
• Superconductivity in Y${}_3$Ru${}_4$Ge${}_{13}$ and Lu${}_3$Os${}_4$Ge${}_{13}$: A comparative study

Cited by in corpus (3)

• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$
• Anomalous temperature dependence of the electrical resistivity in R${}_3$Co${}_4$Ge${}_{13}$ (R = Y, Lu) single crystals