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arXiv · 2505.20702

Magnetic Field Dependence of the Spin Susceptibility on Conventional s-wave Superconductor LaRu$_4$P$_{12}$ Revealed by $^{31}$P-NMR and $^{139}$La-NMR

Riku Matsubayashi·Shiki Ogata·Taishi Ihara·Hiroyasu Matsudaira·Shunsaku Kitagawa·Kenji Ishida·Yusuke Nakai·Hitoshi Sugawara·Hideyuki Sato
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Abstract

The magnetic field dependence of the spin part of Knight shift, which is proportional to the superconducting-state spin susceptibility, was investigated at two nuclear sites, $^{31}$P and $^{139}$La in a conventional s-wave superconductor LaRu$_4$P$_{12}$. After the analyses, we confirmed that the superconducting-state spin susceptibility is proportional to magnetic field, and connects to the normal-state spin susceptibility smoothly. This is a textbook example, when the superconductivity is broken with the orbital pair-breaking effect.

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Riku Matsubayashi, Shiki Ogata, Taishi Ihara, Hiroyasu Matsudaira, Shunsaku Kitagawa, Kenji Ishida, Yusuke Nakai, Hitoshi Sugawara, Hideyuki Sato. 2025-05-27. Magnetic Field Dependence of the Spin Susceptibility on Conventional s-wave Superconductor LaRu$_4$P$_{12}$ Revealed by $^{31}$P-NMR and $^{139}$La-NMR. https://doi.org/10.7566/jpsj.94.063706

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