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論文

NMR evidence for full-gap spin-triplet superconducting state in UBe$$_{13}$$

南 晶子*; 松野 治貴*; 森田 恭平*; 松木 麟太朗*; 小手川 恒*; 播磨 尚朝*; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦*; 藤 秀樹*

Journal of the Physical Society of Japan, 95(7), p.074711_1 - 074711_11, 2026/07

https://doi.org/10.7566/JPSJ.95.074711
 被引用回数：0

We performed $$^{9}$$Be-NMR measurements on UBe$$_{13}$$ to probe its superconducting state. The Knight shift behavior indicates spin-triplet pairing with anisotropic spin susceptibility reduction below $$T^*$$, providing strong evidence for a triplet state. The $$1/T_1$$ data support a multiband, fully gapped model, and symmetry analysis suggests an $$A_{1u} + alpha E_u(1)$$ order parameter, consistent with a fully gapped spin-triplet topological superconductor.

論文

Revisiting $$^{9}$$Be nuclear magnetic resonance in UBe$$_{13}$$; Itinerant-localized duality and possible Fermi surface reconstruction at high magnetic field

松木 麟太朗*; 南 晶子*; 小手川 恒*; 播磨 尚朝*; 芳賀 芳範; 山本 悦嗣; 大貫 惇睦*; 藤 秀樹*

Journal of the Physical Society of Japan, 94(12), p.124702_1 - 124702_8, 2025/11

https://doi.org/10.7566/JPSJ.94.124702
 被引用回数：1 パーセンタイル：0.00(Physics, Multidisciplinary)

We report on new results of $$^{9}$$Be nuclear magnetic resonance measurements conducted on a single crystal of the heavy fermion superconductor UBe$$_{13}$$. A comparison between the knight shift and the classical dipolar shift provides microscopic evidence for the nature of an itinerant-localized duality in UBe$$_{13}$$. Furthermore, a reconstruction of part of the multiple Fermi surfaces in the high-magnetic-field region is suggested.

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