Physical properties of noncentrosymmetric superconductor Ru7B3
Abstract
Transition metal boride Ru7B3 was found to be a noncentrosymmetric superconductor with TC equal to 3.3 K. Superconducting and normal state properties of Ru7B3 were determined by a self-consistent analysis through resistivity(xx and xy), specific heat, lower critical field measurement and electronic band structure calculation. It is found that Ru7B3 belongs to an s-wave dominated single band superconductor with energy gap 0.5 meV and could be categorized into type II superconductor with weak electron-phonon coupling. Unusual 'kink' feature is clearly observed in field-broadening resistivity curves, suggesting the possible mixture of spin triplet induced by the lattice without inversion symmetry.
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