Two distinct superconducting phases in LiFeAs

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 scannin...

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Main Authors:	Nag, P. K., Schlegel, R., Baumann, D., Grafe, H.-J., Beck, R., Wurmehl, S., Büchner, B., Hess, C.
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4906386/

id	pubmed-4906386
recordtype	oai_dc
spelling	pubmed-49063862016-06-15 Two distinct superconducting phases in LiFeAs Nag, P. K. Schlegel, R. Baumann, D. Grafe, H.-J. Beck, R. Wurmehl, S. Büchner, B. Hess, C. Article 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. Nature Publishing Group 2016-06-14 /pmc/articles/PMC4906386/ /pubmed/27297474 http://dx.doi.org/10.1038/srep27926 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Nag, P. K. Schlegel, R. Baumann, D. Grafe, H.-J. Beck, R. Wurmehl, S. Büchner, B. Hess, C.
spellingShingle	Nag, P. K. Schlegel, R. Baumann, D. Grafe, H.-J. Beck, R. Wurmehl, S. Büchner, B. Hess, C. Two distinct superconducting phases in LiFeAs
author_facet	Nag, P. K. Schlegel, R. Baumann, D. Grafe, H.-J. Beck, R. Wurmehl, S. Büchner, B. Hess, C.
author_sort	Nag, P. K.
title	Two distinct superconducting phases in LiFeAs
title_short	Two distinct superconducting phases in LiFeAs
title_full	Two distinct superconducting phases in LiFeAs
title_fullStr	Two distinct superconducting phases in LiFeAs
title_full_unstemmed	Two distinct superconducting phases in LiFeAs
title_sort	two distinct superconducting phases in lifeas
description	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.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4906386/
_version_	1613594159073984512

Two distinct superconducting phases in LiFeAs

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