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

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 , providing strong evidence for a triplet state. The 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.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	95
Number	:	7
Pages	:	p.074711_1 - 074711_11
Publication Year/Month	:	2026/07
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Paper URL	:	https://doi.org/10.7566/JPSJ.95.074711
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	superconductivity; Uranium compound; heavy fermion
Research Facility	:	第4研究棟
Press Release	:	UBe13の完全ギャップ・スピン三重項超伝導; 剥がされた40年にわたる謎のベール
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Cooperating Institute	:	神戸大学

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Registration No. : AA20260123
JAEA Abstracts No. : 54000777
Paper Submission No. : 31255

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