In-plane transport anisotropy in a Ba1−xKxFe2As2 iron-based superconductor. (12th September 2019)

• Record Type: Journal Article
• Authors: Matusiak, Marcin; Wolf, Thomas
• Is Part Of: Superconductor science & technology. Volume 32:Number 10(2019:Oct.)
• Publication Date: 2019-09-12
• Subjects: nematicity -- iron-based superconductor -- magno-thermoelectric effects -- in-plane transport anisotropy; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/ab392f
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We report the in-plane anisotropy of the transport phenomena for the strain-detwinned single crystals of hole-doped 122 iron-pnictide Ba1- x K x Fe2 As2 . We study two under-doped samples ( x = 0.11 and 0.22) which exhibit the simultaneous structural/magnetic transition from the tetragonal, paramagnetic phase to the orthorhombic, spin density wave phase at T tr = 123 K and 86 K, respectively. Data on the anisotropy of the Seebeck and Nernst coefficients as well as the electrical resistivity are compared to results of measurements of Ba(Fe1- x Co x )2 As2 and Ca(Fe1- x Co x )2 As2 from previous studies. We conclude that the low temperature transport phenomena in Ba1- x K x Fe2 As2, unlike ones in the electron-doped counterparts, are possibly determined by anisotropic properties of the Dirac fermions.