1. Center for High Technology Materials University of New Mexico Albuquerque NM 87106 USA
2. Department of Chemical and Biological Engineering University of New Mexico Albuquerque NM 87131 USA
3. Department of Materials Science and Engineering University of Wisconsin‐Madison Madison WI 53706 USA
4. Instituto de Física Gleb Wataghin Universidade Estadual de Campinas Campinas SP 13083‐970 Brazil
5. Departamento de Física Universidade Federal de Minas Gerais Belo Horizonte MG 31270‐901 Brazil
6. Department of Chemical and Biological Engineering University of Wisconsin‐Madison Madison WI 53706 USA
7. Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM 87131 USA