Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

4-1-2012

Journal or Book Title

Physical Review B

Volume

85

Issue

14

First Page

144509

DOI

10.1103/PhysRevB.85.144509

Abstract

The effect of uniaxial tensile stress and the resultant strain on the structural/magnetic transition in the parent compound of the iron arsenide superconductor BaFe2As2 is characterized by temperature-dependent electrical resistivity, x-ray diffraction, and quantitative polarized light imaging. We show that strain induces a measurable uniaxial structural distortion above the first-order magnetic transition and significantly smears the structural transition. This response is different from that found in another parent compound, SrFe2As2, where the coupled structural and magnetic transitions are strongly first order. This difference in the structural responses explains the in-plane resistivity anisotropy above the transition in BaFe2As2. This conclusion is supported by the Ginzburg-Landau-type phenomenological model for the effect of the uniaxial strain on the resistivity anisotropy.

Comments

This article is published as Blomberg, E. C., A. Kreyssig, M. A. Tanatar, R. M. Fernandes, M. G. Kim, A. Thaler, J. Schmalian, S. L. Bud'ko, P. C. Canfield, A. I. Goldman, and R. Prozorov. "Effect of tensile stress on the in-plane resistivity anisotropy in BaFe 2 As 2." Physical Review B 85, no. 14 (2012): 144509. DOI: 10.1103/PhysRevB.85.144509. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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