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Nag PK, Schlegel R, Baumann D, et al. Two distinct superconducting phases in LiFeAs. Sci Rep. 2016;6:27926doi: 10.1038/srep27926.
Nag, P. K., Schlegel, R., Baumann, D., Grafe, H. J., Beck, R., Wurmehl, S., Büchner, B., & Hess, C. (2016). Two distinct superconducting phases in LiFeAs. Scientific reports, 627926. https://doi.org/10.1038/srep27926
Nag, P K, et al. "Two distinct superconducting phases in LiFeAs." Scientific reports vol. 6 (2016): 27926. doi: https://doi.org/10.1038/srep27926
Nag PK, Schlegel R, Baumann D, Grafe HJ, Beck R, Wurmehl S, Büchner B, Hess C. Two distinct superconducting phases in LiFeAs. Sci Rep. 2016 Jun 14;6:27926. doi: 10.1038/srep27926. PMID: 27297474; PMCID: PMC4906386.
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Sci Rep. 2016 Jun 14;6:27926. doi: 10.1038/srep27926.

Two distinct superconducting phases in LiFeAs.

Scientific reports

P K Nag, R Schlegel, D Baumann, H-J Grafe, R Beck, S Wurmehl, B Büchner, C Hess

Affiliations

  1. IFW Dresden, Institute for Solid State Research, 01171 Dresden, Germany.
  2. Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany.
  3. Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany.

PMID: 27297474 PMCID: PMC4906386 DOI: 10.1038/srep27926

Abstract

A non-trivial temperature evolution of superconductivity including a temperature-induced phase transition between two superconducting phases or even a time-reversal symmetry breaking order parameter is in principle expected in multiband superconductors such as iron-pnictides. Here we present scanning tunnelling spectroscopy data of LiFeAs which reveal two distinct superconducting phases: at = 18 K a partial superconducting gap opens, evidenced by subtle, yet clear features in the tunnelling spectra, i.e. particle-hole symmetric coherence peak and dip-hump structures. At Tc = 16 K, these features substantiate dramatically and become characteristic of full superconductivity. Remarkably, the distance between the dip-hump structures and the coherence peaks remains practically constant in the whole temperature regimeT ≤ . This rules out the connection of the dip-hump structures to an antiferromagnetic spin resonance.

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