Universität zu Köln

Matano, K., Kriener, M., Segawa, K., Ando, Y. and Zheng, Guo-qing (2016). Spin-rotation symmetry breaking in the superconducting state of CuxBi2Se3. Nat. Phys., 12 (9). S. 852 - 855. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

Spontaneous symmetry breaking is an important concept for understanding physics ranging from the elementary particles to states of matter. For example, the superconducting state breaks global gauge symmetry, and unconventional superconductors can break further symmetries. In particular, spin-rotational symmetry is expected to be broken in spin triplet superconductors. However, experimental evidence for such symmetry breaking has not been conclusively obtained so far in any candidate compounds. Here, using Se-77 nuclear magnetic resonance measurements, we show that spin-rotation symmetry is spontaneously broken in the hexagonal plane of the electron-doped topological insulator Cu0.3Bi2Se3 below the superconducting transition temperature T-c = 3.4 K. Our results not only establish spin-triplet superconductivity in this compound, but may also serve to lay a foundation for the research of topological superconductivity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Matano, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kriener, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Segawa, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ando, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zheng, Guo-qing UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-265896
DOI:	10.1038/NPHYS3781
Journal or Publication Title:	Nat. Phys.
Volume:	12
Number:	9
Page Range:	S. 852 - 855
Date:	2016
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOPOLOGICAL INSULATORS; KNIGHT-SHIFT; TRIPLET SUPERCONDUCTIVITY; PHASES; UPT3; SR2RUO4 Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26589