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

Abstract

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.

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

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Cited by in corpus (7)

• Superconducting state in the non-centrosymmetric Mg_{9.3}Ir_{19}B_{16.7} and Mg_{10.5}Ir_{19}B_{17.1} revealed by NMR
• Electronic structure, electron-phonon coupling and superconductivity in noncentrosymmetric ThCoC2 from ab initio calculations
• Crystal growth and properties of the non-centrosymmetric superconductor, Ru7B3
• Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor Ru${}_7$B${}_3$
• Pressure study of the noncentrosymmetric 5d-electron superconductors CaMSi3 (M= Ir, Pt)
• Comparative studies on unconventional superconductivity in Cr${}_3$Ru compounds with bcc and A15 structures
• Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru${}_7$B${}_3$ to the London model