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:
CreatorsEmailORCIDORCID Put Code
Yonezawa, ShingoUNSPECIFIEDorcid.org/0000-0002-7476-3604UNSPECIFIED
Tajiri, KengoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakata, SuguruUNSPECIFIEDorcid.org/0000-0003-1675-9532UNSPECIFIED
Nagai, YukiUNSPECIFIEDorcid.org/0000-0001-5098-5440UNSPECIFIED
Wang, ZhiweiUNSPECIFIEDorcid.org/0000-0003-0182-2471UNSPECIFIED
Segawa, KoujiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YoichiUNSPECIFIEDorcid.org/0000-0002-3553-3355UNSPECIFIED
Maeno, YoshiteruUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SYMMETRY-BREAKINGMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/24187

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