Universität zu Köln

Yonezawa, Shingo ORCID: 0000-0002-7476-3604, Tajiri, Kengo, Nakata, Suguru ORCID: 0000-0003-1675-9532, Nagai, Yuki ORCID: 0000-0001-5098-5440, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Segawa, Kouji, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Maeno, Yoshiteru (2017). Thermodynamic evidence for nematic superconductivity in CuxBi2Se3. Nat. Phys., 13 (2). S. 123 - 127. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yonezawa, Shingo UNSPECIFIED orcid.org/0000-0002-7476-3604 UNSPECIFIED Tajiri, Kengo UNSPECIFIED UNSPECIFIED UNSPECIFIED Nakata, Suguru UNSPECIFIED orcid.org/0000-0003-1675-9532 UNSPECIFIED Nagai, Yuki UNSPECIFIED orcid.org/0000-0001-5098-5440 UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Segawa, Kouji UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Maeno, Yoshiteru UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-241877
DOI:	10.1038/NPHYS3907
Journal or Publication Title:	Nat. Phys.
Volume:	13
Number:	2
Page Range:	S. 123 - 127
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SYMMETRY-BREAKING Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24187