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タイトル: | Fully gapped pairing state in spin-triplet superconductor UTe₂ |
著者: | Suetsugu, Shota ![]() ![]() ![]() Shimomura, Masaki Kamimura, Masashi Asaba, Tomoya Asaeda, Hiroto Kosuge, Yuki Sekino, Yuki Ikemori, Shun Kasahara, Yuichi Kohsaka, Yuhki Lee, Minhyea Yanase, Youichi Sakai, Hironori Opletal, Petr Tokiwa, Yoshifumi Haga, Yoshinori Matsuda, Yuji |
著者名の別形: | 末次, 祥大 下邨, 真輝 神村, 真志 浅場, 智也 淺枝, 寛人 小菅, 優揮 関野, 雄輝 池森, 駿 笠原, 裕一 幸坂, 祐生 栁瀬, 陽一 松田, 祐司 |
発行日: | Feb-2024 |
出版者: | American Association for the Advancement of Science (AAAS) |
誌名: | Science Advances |
巻: | 10 |
号: | 6 |
論文番号: | eadk3772 |
抄録: | The recently discovered superconductor UTe₂ is a promising candidate for spin-triplet superconductors, but the symmetry of the superconducting order parameter remains highly controversial. Here, we determine the superconducting gap structure by the thermal conductivity of ultraclean UTe₂ single crystals. We find that the a-axis thermal conductivity divided by temperature κ/T in zero-temperature limit is vanishingly small for both magnetic field H‖a and H‖c axes up to H/Hc₂ ∼ 0.2, demonstrating the absence of nodes around the a axis contrary to the previous belief. The present results, combined with the reduction of nuclear magnetic resonance Knight shift, indicate that the superconducting order parameter belongs to the isotropic Au representation with a fully gapped pairing state, analogous to the B phase of superfluid ³He. These findings reveal that UTe₂ is likely to be a long-sought three-dimensional strong topological superconductor, hosting helical Majorana surface states on any crystal plane. |
著作権等: | Copyright © 2024 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/287383 |
DOI(出版社版): | 10.1126/sciadv.adk3772 |
PubMed ID: | 38324692 |
出現コレクション: | 学術雑誌掲載論文等 |
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