Publication Date

7-9-2020

Department

Ames Laboratory; Materials Science and Engineering; Physics and Astronomy

Campus Units

Ames Laboratory, Materials Science and Engineering, Physics and Astronomy

OSTI ID+

1638699

Report Number

IS-J 10264

DOI

10.1063/5.0012053

Journal Title

Review of Scientific Instruments

Volume Number

91

Issue Number

7

First Page

073904

Abstract

Uniaxial stress is used to detwin the samples of orthorhombic iron based superconductors to study their intrinsic electronic anisotropy. Here, we describe the development of a new detwinning setup enabling variable-load stress-detwinning with easy sample mounting/dismounting without the need to re-solder the contacts. It enables the systematic study of the anisotropy evolution as a function of an external parameter when the sample is modified between the measurements. In our case, the external parameter is the dose of 2.5 MeV electron irradiation at low temperature. We illustrate the approach by studying resistivity anisotropy in single crystals of Ba1−xKxFe2As2 at x = 0.25, where the much discussed unusual re-entrance of the tetragonal C4 phase, C4 → C2 → C4, is observed on cooling. With the described technique, we found a significant anisotropy increase in the C2 phase after electron irradiation with a dose of 2.35 C/cm2.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

47 OTHER INSTRUMENTATION

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Friday, July 09, 2021

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