Thermodynamic evidence for nematic superconductivity in CuxBi2Se3
In a nematic liquid crystal, electron orbitals align themselves along one axis, as rods. Thermodynamic observations of such rod-like alignments in Cu x Bi 2 Se 3 provide evidence for a nematic superconductor. In condensed matter physics, spontaneous symmetry breaking has been a key concept, and disc...
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| Published in: | Nature physics Vol. 13; no. 2; pp. 123 - 126 |
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| Main Authors: | , , , , , , , |
| Format: | Journal Article |
| Language: | English |
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| Abstract | In a nematic liquid crystal, electron orbitals align themselves along one axis, as rods. Thermodynamic observations of such rod-like alignments in Cu
x
Bi
2
Se
3
provide evidence for a nematic superconductor.
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 matter
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
,
4
,
5
,
6
. Here, we show bulk thermodynamic evidence for nematic superconductivity, in which the nematicity emerges in the superconducting gap amplitude, in Cu
x
Bi
2
Se
3
. 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
,
8
,
9
. Thus, our findings establish a new class of spontaneously symmetry-broken states of matter—namely, odd-parity nematic superconductivity. |
|---|---|
| AbstractList | In a nematic liquid crystal, electron orbitals align themselves along one axis, as rods. Thermodynamic observations of such rod-like alignments in Cu
x
Bi
2
Se
3
provide evidence for a nematic superconductor.
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 matter
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
,
4
,
5
,
6
. Here, we show bulk thermodynamic evidence for nematic superconductivity, in which the nematicity emerges in the superconducting gap amplitude, in Cu
x
Bi
2
Se
3
. 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
,
8
,
9
. Thus, our findings establish a new class of spontaneously symmetry-broken states of matter—namely, odd-parity nematic superconductivity. 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 matter. Recently, electronic nematicity, novel spontaneous rotational-symmetry breaking leading to an emergence of a special direction in electron liquids, has been attracting significant attention. Here, we show bulk thermodynamic evidence for nematic superconductivity, in which the nematicity emerges in the superconducting gap amplitude, in CuxBi2Se3. |
| Author | Tajiri, Kengo Yonezawa, Shingo Nagai, Yuki Nakata, Suguru Segawa, Kouji Ando, Yoichi Wang, Zhiwei Maeno, Yoshiteru |
| Author_xml | – sequence: 1 givenname: Shingo orcidid: 0000-0002-7476-3604 surname: Yonezawa fullname: Yonezawa, Shingo email: yonezawa@scphys.kyoto-u.ac.jp organization: Department of Physics, Graduate School of Science, Kyoto University – sequence: 2 givenname: Kengo surname: Tajiri fullname: Tajiri, Kengo organization: Department of Physics, Graduate School of Science, Kyoto University – sequence: 3 givenname: Suguru surname: Nakata fullname: Nakata, Suguru organization: Faculty of Science, Kyoto University – sequence: 4 givenname: Yuki orcidid: 0000-0001-5098-5440 surname: Nagai fullname: Nagai, Yuki organization: CCSE, Japan Atomic Energy Agency – sequence: 5 givenname: Zhiwei surname: Wang fullname: Wang, Zhiwei organization: The Institute of Scientific and Industrial Research, Osaka University, Institute of Physics II, University of Cologne – sequence: 6 givenname: Kouji surname: Segawa fullname: Segawa, Kouji organization: The Institute of Scientific and Industrial Research, Osaka University, Department of Physics, Graduate School of Science, Kyoto Sangyo University – sequence: 7 givenname: Yoichi orcidid: 0000-0002-3553-3355 surname: Ando fullname: Ando, Yoichi organization: The Institute of Scientific and Industrial Research, Osaka University, Institute of Physics II, University of Cologne – sequence: 8 givenname: Yoshiteru surname: Maeno fullname: Maeno, Yoshiteru organization: Department of Physics, Graduate School of Science, Kyoto University |
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| Copyright | Springer Nature Limited 2016 Copyright Nature Publishing Group Feb 2017 |
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| Snippet | In a nematic liquid crystal, electron orbitals align themselves along one axis, as rods. Thermodynamic observations of such rod-like alignments in Cu
x
Bi
2
Se... In condensed matter physics, spontaneous symmetry breaking has been a key concept, and discoveries of new types of broken symmetries have greatly increased our... |
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| Title | Thermodynamic evidence for nematic superconductivity in CuxBi2Se3 |
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