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

UBe$$_{13}$$における、フルギャップスピン三重項超伝導についてのNMRによる実験的証拠

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*

Minami, Shoko*; Matsuno, Haruki*; Morita, Kyohei*; Matsuki, Rintaro*; Kotegawa, Hisashi*; Harima, Hisatomo*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika*; Tou, Hideki*

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.

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