Details

Autor(en) / Beteiligte

• Böhmer, A. E.
• Hardy, F.
• Eilers, F.
• Ernst, D.
• Adelmann, P.
• Schweiss, P.
• Wolf, T.
• Meingast, C.

Titel

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

Ist Teil von

• Physical review. B, Condensed matter and materials physics, 2013-05, Vol.87 (18), Article 180505

Erscheinungsjahr

2013

Link zum Volltext

Quelle

PROLA

Beschreibungen/Notizen

• 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.