Abstract
LiTi 2 O 4 and LiV 2 O 4 are both normal spinel structure oxides. LiTi 2 O 4 is a superconductor with the transition temperature T c as high as 13 K. While LiV 2 O 4 shows metallic conduction and the magnetic susceptibility follows the Curie-Weiss law, suggesting localized magnetic moments. We report on the detailed electrical and magnetic properties of Li(Ti 1−x V x ) 2 O 4 system for 0≦x≦0.05 with an emphasis on the low V concentration. As the V content is increased, the specimen exhibits lower T c and undergoes a smooth transition. For x = 0.05 , the superconductivity is almost smeared out. The localized magnetic moment per V atom is estimated to be about 1.7μ B which indicates V 4+ state with S = 1/2 . The localized magnetic moments, induced by the V-doping, are responsible for the pair breaking and the extremely sensitive destruction of the superconductivity. The decay of T c as a function of V concentration is similar to AlMn and ThU. Pair breaking mechanism in the superconductivity in these specimens is not interpreted simply in terms of the Abrikosov and Gor'kov theory.
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