Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe

The coupling between superconductivity and orthorhombic distortion is studied in vapor-grown FeSe single crystals using high-resolution thermal-expansion measurements. In contrast to the Ba122-based (Ba122) superconductors, we find that superconductivity does not reduce the orthorhombicity below T s...

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Veröffentlicht in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-05, Vol.87 (18), Article 180505
Hauptverfasser:	Böhmer, A. E., Hardy, F., Eilers, F., Ernst, D., Adelmann, P., Schweiss, P., Wolf, T., Meingast, C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter Couples Distortion Iron Joining Single crystals Superconductivity Superconductors
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container_title	Physical review. B, Condensed matter and materials physics
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creator	Böhmer, A. E. Hardy, F. Eilers, F. Ernst, D. Adelmann, P. Schweiss, P. Wolf, T. Meingast, C.
description	The coupling between superconductivity and orthorhombic distortion is studied in vapor-grown FeSe single crystals using high-resolution thermal-expansion measurements. In contrast to the Ba122-based (Ba122) superconductors, we find that superconductivity does not reduce the orthorhombicity below T sub(c). Instead we find that superconductivity couples strongly to the in-plane area, which explains the large hydrostatic pressure effects. We discuss our results in light of the spin-nematic scenario and argue that FeSe has many features that are quite different from typical Fe-based superconductors.
doi_str_mv	10.1103/PhysRevB.87.180505
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subjects	Condensed matter Couples Distortion Iron Joining Single crystals Superconductivity Superconductors
title	Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
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