title: Upper Critical Field and Kondo Effects in Fe(Te0.9Se0.1) Thin Films by Pulsed Field Measurements.
abstract: The transition temperatures of epitaxial films of Fe(Te0:9Se0:1) are remarkably insensitive to applied magnetic field, leading to predictions of upper critical fields Bc2(T = 0) in excess of 100 T. Using pulsed magnetic fields, we find Bc2(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 Bc2(T), consistent with the observed Kondo minimum seen above Tc. 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.
authors: Department of Physics, The University of Texas at Dallas, Richardson, TX 75080 USA.|National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545.
authors: Myron B
authors: MB
authors: Salamon
authors: Naval Surface Warfare Center, Corona Div., Norco, CA 92860.
authors: Nicholas
authors: N
authors: Cornell
authors: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545.
authors: Marcelo
authors: M
authors: Jaime
authors: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545.
authors: Fedor F
authors: FF
authors: Balakirev
authors: Department of Physics, The University of Texas at Dallas, Richardson, TX 75080 USA.
authors: Anvar
authors: A
authors: Zakhidov
authors: Department of Materials Science, Texas A&M University, College Station, TX 77843-3128.
authors: Jijie
authors: J
authors: Huang
authors: Department of Materials Science, Texas A&M University, College Station, TX 77843-3128.
authors: Haiyan
authors: H
authors: Wang