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  Two-Gap Superconductivity in LaNiGa2 with Nonunitary Triplet Pairing and Even Parity Gap Symmetry

Weng, Z. F., Zhang, J. L., Smidman, M., Shang, T., Quintanilla, J., Annett, J. F., et al. (2016). Two-Gap Superconductivity in LaNiGa2 with Nonunitary Triplet Pairing and Even Parity Gap Symmetry. Physical Review Letters, 117(2): 027001, pp. 1-5. doi:10.1103/PhysRevLett.117.027001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2472-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-ACC9-9
Genre: Journal Article

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 Creators:
Weng, Z. F.1, Author
Zhang, J. L.1, Author
Smidman, M.1, Author
Shang, T.1, Author
Quintanilla, J.1, Author
Annett, J. F.1, Author
Nicklas, M.2, Author              
Pang, G. M.1, Author
Jiao, L.1, Author
Jiang, W. B.1, Author
Chen, Y.1, Author
Steglich, F.3, Author              
Yuan, H. Q.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863472              
3Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: The nature of the pairing states of superconducting LaNiC2 and LaNiGa2 has to date remained a puzzling question. Broken time reversal symmetry has been observed in both compounds and a group theoretical analysis implies a nonunitary triplet pairing state. However, all the allowed nonunitary triplet states have nodal gap functions but most thermodynamic and NMR measurements indicate fully gapped superconductivity in LaNiC2. Here we probe the gap symmetry of LaNiGa2 by measuring the London penetration depth, specific heat, and upper critical field. These measurements demonstrate two-gap nodeless superconductivity in LaNiGa2, suggesting that this is a common feature of both compounds. These results allow us to propose a novel triplet superconducting state, where the pairing occurs between electrons of the same spin, but on different orbitals. In this case the superconducting wave function has a triplet spin component but isotropic even parity gap symmetry, yet the overall wave function remains antisymmetric under particle exchange. This model leads to a nodeless two-gap superconducting state which breaks time reversal symmetry, and therefore accounts well for the seemingly contradictory experimental results.

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Language(s): eng - English
 Dates: 2016-07-072016-07-07
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 117 (2) Sequence Number: 027001 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1