Physics – Condensed Matter – Superconductivity
Scientific paper
2011-11-03
Phys. Rev. B 85, 144509 (2012)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.85.144509
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$_2$As$_2$, 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$_2$As$_2$, where the coupled structural and magnetic transitions are strongly first order. This difference in the structural responses explains the in-plain resistivity anisotropy above the transition in BaFe$_2$As$_2$. This conclusion is supported by the Ginzburg-Landau - type phenomenological model for the effect of the uniaxial strain on the resistivity anisotropy.
Blomberg E. C.
Bud'ko Sergey L.
Canfield Paul. C.
Fernandes Richard
Goldman Alan I.
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