Journal
NATURE PHYSICS
Volume 13, Issue 2, Pages 123-126Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3907
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Funding
- JSPS [KAKENHI JP22103002, JP22103004, KAKENHI JP26287078, JP26800197, KAKENHI JP15H05852, JP15H05853, JP16H00995]
- DFG 'Control and Dynamics of Quantum Materials' [CRC1238]
- Grants-in-Aid for Scientific Research [26800197, 15H05853, 26287078, 16H00995, 15K21717] Funding Source: KAKEN
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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.
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