Susceptibility anisotropy in an iron arsenide superconductor revealed by X-ray diffraction in pulsed magnetic fields

J. P.C. Ruff, J. H. Chu, H. H. Kuo, R. K. Das, H. Nojiri, I. R. Fisher, Z. Islam

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

In addition to unconventional high-T c superconductivity, the iron arsenides exhibit strong magnetoelastic coupling and a notable electronic anisotropy within the a-b plane. We relate these properties by studying underdoped Ba(Fe 1-xCo x) 2As 2 by x-ray diffraction in pulsed magnetic fields up to 27.5 T. We exploit magnetic detwinning effects to demonstrate anisotropy in the in-plane susceptibility, which develops at the structural phase transition despite the absence of magnetic order. The degree of detwinning increases smoothly with decreasing temperature, and a single-domain condition is realized over a range of field and temperature. At low temperatures we observe an activated behavior, with a large hysteretic remnant effect. Detwinning was not observed within the superconducting phase for accessible magnetic fields.

Original languageEnglish
Article number027004
JournalPhysical review letters
Volume109
Issue number2
DOIs
Publication statusPublished - 2012 Jul 11

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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