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Nematic Susceptibility of Hole-Doped and Electron-Doped BaFe2As2 Iron-Based Superconductors from Shear Modulus Measurements

Autor(en)

A. E. Böhmer, P. Burger, F. Hardy, T. Wolf, P. Schweiss, R. Fromknecht, M. Reinecker, W. Schranz, C. Meingast

Abstrakt

The nematic susceptibility, χφ, of hole-doped Ba1−xKxFe2As2 and electron-doped Ba(Fe1−xCox)2As2

iron-based superconductors is obtained from measurements of the elastic

shear modulus using a three-point bending setup in a capacitance

dilatometer. Nematic fluctuations, although weakened by doping, extend

over the whole superconducting dome in both systems, suggesting their

close tie to superconductivity. Evidence for quantum critical behavior

of χφ is, surprisingly, only found for Ba(Fe1−xCox)2As2 and not for Ba1−xKxFe2As2—the system with the higher maximal Tc value.

Organisation(en)

Physik Funktioneller Materialien

Externe Organisation(en)

Karlsruher Institut für Technologie

Journal

Physical Review Letters

Band

112

Anzahl der Seiten

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.112.047001

Publikationsdatum

01-2014

Peer-reviewed

ÖFOS 2012

103018 Materialphysik

Schlagwörter

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