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)
