1. Center for High Technology Materials, University of New Mexico 1 , 1313 Goddard St SE, Albuquerque, New Mexico 87106, USA
2. Department of Physics and Astronomy, University of Kansas 2 , Lawrence, Kansas 66045, USA
3. Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory 3 , Los Alamos, New Mexico 87544, USA
4. Materials Development, Inc. 4 , Evanston, Illinois 60202, USA