Abstract
11B NMR measurements have been performed on rare earth ternary borides, YRuB2, LuRuB2 and (Tm0.4Y0.6)RuB2 to investigate their electronic states. From the measurements of temperature dependence of spin-lattice relaxation rate 1/T1, YRuB2 and LuRuB2 are found to be Bardeen-Cooper-Schrieffer (BCS) superconductors with the energy gap 2Δ(0)=3.52 kBTc and the superconducting transition temperatures Tc=7.6 K (YRuB2) and 10.2 K (LuRuB2). A very broad and temperature dependent spectrum is observed in (Tm0.4Y0.6)RuB2. The magnitude of 1/T1T is considerably larger in (Tm0.4Y0.6)RuB2 than in YRuB2 and LuRuB2. These facts suggest the contribution of 4f electrons to the hyperfine field at 11B nuclei in (Tm0.4Y0.6)RuB2.
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