Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
Y. Aoki, A. Tsuchiya, T. Kanayama, S.R.Saha, H. Sugawara, H. Sato, W., Higemoto, A. Koda, K. Ohishi, K. Nishiyama, R. Kadono
TL;DR
This paper presents muon spin relaxation measurements that demonstrate time-reversal symmetry-breaking in the superconducting state of the heavy-fermion compound PrOs4Sb12, indicating unconventional superconductivity.
Contribution
It provides the first direct experimental evidence of time-reversal symmetry-breaking in PrOs4Sb12 using muon spin relaxation techniques.
Findings
Detection of spontaneous internal magnetic fields below Tc
Evidence for unconventional, symmetry-breaking superconductivity
Implications for the nature of Cooper pairs in heavy fermion superconductors
Abstract
We report on muon spin relaxation measurements of the 4f^2-based heavy-fermion superconductor filled-skutterudite PrOs4Sb12. The results reveal the spontaneous appearance of static internal magnetic fields below the superconducting transition temperature, providing unambiguous evidence for the breaking of time-reversal symmetry in the superconducting state. A discussion is made on which of the spin or orbital component of Cooper pairs carries a nonzero momentum.
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