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Dynamics of Local Bond Correlations in FeSe x Te1−x by Inelastic Neutron Scattering

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Abstract

The dynamics of the local atomic pair correlations in the FeSe x Te1−x ( x = 0.1, 0.5, and 0.9) system were investigated using the dynamic pair density function analysis obtained from inelastic neutron scattering. Distinct differences are observed between the superconducting and nonsuperconducting compositions, particularly involving the local dynamics of the Fe-Fe correlations. The energy scale of the observed differences is between 25 and 30 meV. In the nonsuperconducting FeSe0.1Te0.9, the Fe-Fe correlations are enhanced with cooling that may signal stronger exchange interactions, while in the superconducting compositions of FeSe0.9Te0.1 and FeSe0.5Te0.5, they are suppressed.

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Acknowledgements

This work is supported by the U. S. Department of Energy under contracts DE-FG02-01ER45927 at the University of Virginia. The authors would like to thank J.-Q. Yan for providing the samples for this work. They also acknowledge useful discussions with W. Dmowski.

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Authors and Affiliations

  1. Department of Physics, University of Virginia, Charlottesville, VA, 22904, USA

    Keeseong Park & Despina Louca

  2. ISIS Spallation Neutron Source, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK

    Jon W. Taylor

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  1. Keeseong Park
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Correspondence to Despina Louca.

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Park, K., Taylor, J.W. & Louca, D. Dynamics of Local Bond Correlations in FeSe x Te1−x by Inelastic Neutron Scattering. J Supercond Nov Magn 27, 1927–1934 (2014). https://doi.org/10.1007/s10948-014-2547-7

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  • DOI: https://doi.org/10.1007/s10948-014-2547-7

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