Abstract
nuclear quadrupole resonance (NQR) has been observed in the ternary compound which, when stoichiometric, is a heavy-fermion superconductor. In a superconducting specimen ( K) the observed temperature dependence of the spin-lattice relaxation rate is consistent with a conventional quasiparticle excitation spectrum below , with a pair-breaking parameter approximately half the value for suppression of superconductivity. Features in between and 1.2 K appear to signal a phase transition, possibly structural in nature. NQR data from a nonsuperconducting sample are consistent with extensive disorder in the Cu site occupation.
- Received 23 April 1984
DOI:https://doi.org/10.1103/PhysRevB.30.1577
©1984 American Physical Society