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arXiv · 0811.2252

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

Lei Fang·Huan Yang·Xiyu Zhu·Gang Mu·Zhao-Sheng Wang·Lei Shan·Cong Ren·Hai-Hu Wen
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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($ρ_{xx}$ and $ρ_{xy}$), 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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Lei Fang, Huan Yang, Xiyu Zhu, Gang Mu, Zhao-Sheng Wang, Lei Shan, Cong Ren, Hai-Hu Wen. 2008-11-17. Physical properties of noncentrosymmetric superconductor Ru$_7$B$_3$. https://doi.org/10.1103/physrevb.79.144509

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