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Scaling of the Stress and Temperature Dependence of the Optical Anisotropy in Ba(Fe1−x Co x )2As2

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Abstract

We revisit our recent investigations of the optical properties in the underdoped regime of the title compounds with respect to their anisotropic behavior as a function of both temperature and uniaxial stress across the ferro-elastic tetragonal-to-orthorhombic transition. By exploiting a dedicated pressure device, we can tune and control uniaxial stress in situ thus changing the degree of detwinning of the samples in the orthorhombic SDW state as well as pressure-inducing an orthorhombicity in the paramagnetic tetragonal phase. We discover a hysteretic behavior of the optical anisotropy; its stress versus temperature dependence across the structural transition bears testimony to the analogy with the magnetic-field versus temperature dependence of the magnetization in a ferromagnet when crossing the Curie temperature. In this context, we find furthermore an intriguing scaling of the stress and temperature dependence of the optical anisotropy in Ba(Fe1−x Co x )2As2.

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Acknowledgments

The authors wish to thank E. Bascones, R. Fernandes, B. Valenzuela, and A. Chubukov for fruitful discussions. This work was supported by the Swiss National Science Foundation (SNSF). Work at Stanford University was supported by the Department of Energy, Office of Basic Energy Sciences under contract DE-AC02-76SF00515.

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Authors and Affiliations

  1. Laboratorium für Festkörperphysik, ETH - Zürich, 8093, Zürich, Switzerland

    C. Mirri, A. Dusza, S. Bastelberger & L. Degiorgi

  2. Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA

    J.-H. Chu, H.-H. Kuo & I. R. Fisher

  3. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, 94305, USA

    J.-H. Chu, H.-H. Kuo & I. R. Fisher

  4. Stanford Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA

    J.-H. Chu, H.-H. Kuo & I. R. Fisher

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  1. C. Mirri
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  2. A. Dusza
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  3. S. Bastelberger
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  4. J.-H. Chu
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  5. H.-H. Kuo
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  6. I. R. Fisher
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  7. L. Degiorgi
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Correspondence to L. Degiorgi.

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Mirri, C., Dusza, A., Bastelberger, S. et al. Scaling of the Stress and Temperature Dependence of the Optical Anisotropy in Ba(Fe1−x Co x )2As2 . J Supercond Nov Magn 29, 3053–3057 (2016). https://doi.org/10.1007/s10948-016-3773-y

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  • DOI: https://doi.org/10.1007/s10948-016-3773-y

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