Paring symmetry in heavy fermion superconductor probed by SR

Higemoto, Wataru  

Paring symmetry in a superconducting state isone of a most crucial information to understand the mechanism of the superconductivity. I report the possible paring symmetries in heavy fermion superconductors CePtSi and PrOsSb, based on the results of muon spin rotation/relaxationmeasurements. CePtSi is the first example of the superconductor lacking an inversion center in the crystal structure. The muon Knight shift at 17 kOe remained unchanged on passing the temperature through down to 20 mK. This result indicates that the local spin susceptibility does not change upon the superconducting transition. PrOsSb is the heavy fermion superconductor exhibiting unconventional superconductivity. At low temperature, no reduction of muon Knight shift passing through is observed. The detail of the muon Knight shift results, including an anisotropy and a substitution effect, will be reported.