Physical properties of noncentrosymmetric superconductor Ru$_7$B$_3$

Details Physical properties of noncentrosymmetric superconductor Ru$_7$B$_3$ Physical properties of noncentrosymmetric superconductor Ru$_7$B$_3$

2008-11-14

arxiv.org/abs/0811.2252v2

PHYSICAL REVIEW B 79, 144509 (2009)

Physics

Condensed Matter

Superconductivity

11 pages, 16 figures. submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.144509

Transition metal boride Ru$_7$B$_3$ was found to be a noncentrosymmetric superconductor with $T_{C}$ equal to 3.3 K. Superconducting and normal state properties of Ru$_7$B$_3$ were determined by a self-consistent analysis through resistivity($\rho_{xx}$ and $\rho_{xy}$), specific heat, lower critical field measurement and electronic band structure calculation. It is found that Ru$_7$B$_3$ 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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