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Anisotropic Superconducting Gap in Optimally Doped Iron–Based Material

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Abstract

We offer a comprehensive optical investigation of the optimally hole-doped Ba0.6K0.4Fe2As2 over a broad spectral range, as a function of temperature and of tunable applied stress, which acts as an external symmetry breaking field. We show that there is a large electronic nematicity at optimal doping which extends right under the superconducting dome and implies an anisotropy of the superconducting energy gaps.

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Notes

  1. As in refs. [16] and [17], we refer here to the He gas pressure inside the volume of the bellows (pbellows): the effective stress felt by the sample (psample) depends on its size and thickness, so that pbellows = 0.1 bar corresponds to an effective uniaxial stress of about \(p_{\text {sample}} \sim \) 2.5 MPa on our crystals. It has been widely established that an effective stress of at least 10 MPa is enough to reveal the underlying symmetry-breaking [2].

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Acknowledgments

The authors wish to thank R. Fernandes, M. Schütt, L. Benfatto, L. Fanfarillo, B. Valenzuela, E. Bascones, and A. Chubukov for fruitful discussions.

Funding

This work was financially supported by the Swiss National Science Foundation (SNSF). Work at Stanford University was financially supported by the Department of Energy, Office of Basic Energy Sciences under contract DE-AC02-76SF00515.

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Author notes

  1. J.-H. Chu

    Present address: Department of Physics, University of Washington, Seattle, WA, 98103, USA

Authors and Affiliations

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

    A. Pal, M. Chinotti & L. Degiorgi

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

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

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

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

  4. 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

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  1. A. Pal
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  2. M. Chinotti
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Correspondence to L. Degiorgi.

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Pal, A., Chinotti, M., Chu, JH. et al. Anisotropic Superconducting Gap in Optimally Doped Iron–Based Material. J Supercond Nov Magn 33, 2313–2318 (2020). https://doi.org/10.1007/s10948-019-05390-4

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  • DOI: https://doi.org/10.1007/s10948-019-05390-4

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