Effect of tensile stress on the in-plane resistivity anisotropy in BaFe[subscript 2]As[subscript 2]

Journal Article · Wed Jul 25 04:00:00 EDT 2012 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.85.144509· OSTI ID:1043726

Blomberg, E C; Kreyssig, A; Tanatar, M A; Fernandes, R M; Kim, M G; Thaler, A; Schmalian, J; Bud,; ko, S L; Canfield, P C; Goldman, A I; Prozorov, R ^[1]

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1. Ames

The effect of uniaxial tensile stress and the resultant strain on the structural/magnetic transition in the parent compound of the iron arsenide superconductor BaFe{sub 2}As{sub 2} 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, SrFe{sub 2}As{sub 2}, 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 BaFe{sub 2}As{sub 2}. This conclusion is supported by the Ginzburg-Landau-type phenomenological model for the effect of the uniaxial strain on the resistivity anisotropy.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: DOE - BASIC ENERGY SCIENCES
• OSTI ID: 1043726
• Journal Information: Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: (14) ; 04, 2012 Vol. 85; ISSN 1098-0121
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
BARIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
IRON ARSENIDES
STRAINS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION