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Title: Upper critical field and Kondo effects in Fe(Te0.9Se0.1) thin films by pulsed field measurements

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. Lastly, we suggest that Kondo localization plays a similar role to spin-orbit pair breaking in making WHH fits to the data.
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5]
  1. Univ. of Texas at Dallas, Richardson, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
  2. Naval Surface Warfare Center, Norco, CA (United States). Corona Div.
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab. (MagLab)
  4. Univ. of Texas at Dallas, Richardson, TX (United States)
  5. Texas A&M Univ., College Station, TX (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
DMR-1157490; FA9550-09-1-0384
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); US Air Force Office of Scientific Research
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY electronic properties and materials; superconducting properties and materials