11B NMR study of superconductivity in YRuB2 and LuRuB2

To investigate the electronic state in ternary borides YRuB2 and LuRuB2, B-11-NMR has been measured. Knight shift K is negative and temperature independent in the normal state and decreases below the superconducting transition temperature T-c. The spin-lattice relaxation rate 1/T-1 measured in YRuB2 is proportional to the temperature T in the normal state and shows a small coherence peak just below Tc 7.6K and decreases with decreasing temperature. (c) 2006 Elsevier B.V. All rights reserved.