Upper Critical Field and Kondo Effects in Fe(Te{0.9} Se{0.1}) Thin Films by Pulsed Field Measurements

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Upper Critical Field and Kondo Effects in Fe(Te{0.9} Se{0.1}) Thin Films by Pulsed Field Measurements

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Title: Upper Critical Field and Kondo Effects in Fe(Te{0.9} Se{0.1}) Thin Films by Pulsed Field Measurements
Author(s):
Salamon, Myron B. (UT Dallas);
Cornell, N.;
Jaime, M.;
Balakirev, F. F.;
Zakhidov, Anvar A. (UT Dallas);
Huang, J.;
Wang, H.
Item Type: Article
Keywords: Show Keywords
Abstract: The transition temperatures of epitaxial films of Fe(Te{0.9} Se {0.1}) are remarkably insensitive to applied magnetic field, leading to predictions of upper critical fields B{c2}(T = 0) in excess of 100 T. Using pulsed magnetic fields, we find B{c2}(0) to be on the order of 45 T, similar to values in bulk material and still in excess of the paramagnetic limit. The same films show strong magnetoresistance in fields above B{c2}(T), consistent with the observed Kondo minimum seen above T{c}. Fits to the temperature dependence in the context of the WHH model, using the experimental value of the Maki parameter, require an effective spin-orbit relaxation parameter of order unity. We suggest that Kondo localization plays a similar role to spin-orbit pair breaking in making WHH fits to the data.
Publisher: Nature Publishing Group
ISSN: 2045-2322
Persistent Link: http://hdl.handle.net/10735.1/5057
http://dx.doi.org/10.1038/srep21469
Bibliographic Citation: Salamon, M. B., N. Cornell, M. Jaime, F. F. Balakirev, et al. 2016. "Upper critical field and kondo effects in Fe(Te 0.9 Se 0.1) thin films by pulsed field measurements." Scientific Reports 6, doi: 10.1038/srep21469
Terms of Use: CC BY 4.0 (Attribution) License
©2016 The Authors
Sponsors: NSF Cooperative Grant No. DMR-1157490; US Air Force Office of Scientific Research contract FA9550-09-1-0384

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