Time-reversal symmetry breaking in superconducting Pr$_{1-x}$Ce$_{x}$Pt$_4$Ge$_{12}$
ORAL
Abstract
Zero-field muon-spin-relaxation ($\mu$SR) experiments were performed on the superconductors Pr$_{1-x}$Ce$_{x}$Pt$_4$Ge$_{12}$ ($x < 0.2$). The results reveal the spontaneous appearance of static internal magnetic fields below the superconducting transition temperature ($T_c$). This observation implies time-reversal symmetry breaking in Pr$_{1-x}$Ce$_{x}$Pt$_4$Ge$_{12}$ ($x < 0.2$) below $T_c$.
*This work was supported by Chinese NSF, grant 11204041, NSF of Shanghai, grant 12ZR1401200, the U.S. NSF, grants DMR-0801407 (Riverside), and the U.S. DOE, contract DE-FG-02-04ER46105 (San Diego).
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