Quasiparticle Excitation in the Superconducting Pyrochlore Cd₂Re₂O₇ Probed by Muon Spin Rotation

抄録

The quasiparticle excitations in the mixed state of Cd₂Re₂O₇ have been studied by means of muon spin rotation/relaxation (μSR). The temperature dependence of the magnetic penetration depth (λ) is consistent with a nearly isotropic superconducting order parameter, although a slight discrepancy which is dependent on the details in the analysis may be present. This is also supported by the relatively weak field dependence of λ.