Composition controlled spin polarization in Co1−xFexS2: Electronic, magnetic, and thermodynamic properties

L. Wang,1 T. Y. Chen,2 C. L. Chien,2 J. G. Checkelsky,3 J. C. Eckert,3 E. D. Dahlberg,4 K. Umemoto,1,5 R. M. Wentzcovitch,1,5 and C. Leighton1,* 1Department of Chemical Engineering and Materials Science, University of Minnesota, 151 Amundson Hall, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, USA 2Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA 3Department of Physics, Harvey Mudd College, 301 E. 12th Street, Claremont, California 91711, USA 4School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, USA 5Supercomputer Institute, University of Minnesota, 117 Pleasant Street SE, Minneapolis, Minnesota 55455, USA Received 3 January 2006; revised manuscript received 6 March 2006; published 3 April 2006