Salamon, Myron B.Cornell, N.Jaime, M.Balakirev, F. F.Zakhidov, Anvar A.Huang, J.Wang, H.2016-09-232016-09-232016-02-102016-02-102045-2322http://hdl.handle.net/10735.1/5057The 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.enCC BY 4.0 (Attribution)©2016 The Authorshttp://creativecommons.org/licenses/by/4.0/MagnetoresistanceMagnetic fieldsKondo effectThin filmsIron-based superconductorsArticleSalamon, 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/srep214696