|
セガワ コウジ
SEGAWA KOJI
瀬川 耕司 所属 京都産業大学 理学部 物理科学科 職種 教授 |
|
| 言語種別 | 英語 |
| 発行・発表の年月 | 2017/02 |
| 形態種別 | 研究論文 |
| 標題 | Thermodynamic evidence for nematic superconductivity in CuxBi2Se3 |
| 執筆形態 | その他 |
| 掲載誌名 | NATURE PHYSICS |
| 出版社・発行元 | NATURE PUBLISHING GROUP |
| 巻・号・頁 | 13(2),pp.123-126 |
| 著者・共著者 | Shingo Yonezawa,Kengo Tajiri,Suguru Nakata,Yuki Nagai,Zhiwei Wang,Kouji Segawa,Yoichi Ando,Yoshiteru Maeno |
| 概要 | In condensed matter physics, spontaneous symmetry breaking has been a key concept, and discoveries of new types of broken symmetries have greatly increased our understanding of matteru(1,2). Recently, electronic nematicity, novel spontaneous rotational-symmetry breaking leading to an emergence of a special direction in electron liquids, has been attracting significant attention(3-6). Here, we show bulk thermodynamic evidence for nematic superconductivity, in which the nematicity emerges in the superconducting gap amplitude, in CuxBi2Se3. Based on high-resolution calorimetry of single-crystalline samples under accurate two-axis control of the magnetic field direction, we discovered clear two-fold symmetry in the specific heat and in the upper critical field despite the trigonal symmetry of the lattice. Nematic superconductivity for this material should possess a unique topological nature associated with odd parity(7-9). Thus, our findings establish a new class of spontaneously symmetry-broken states of matter namely, odd-parity nematic superconductivity. |
| DOI | 10.1038/NPHYS3907 |
| ISSN | 1745-2473/1745-2481 |
| PermalinkURL | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84990911121&origin=inward |