Dielectric anomalies and spiral magnetic order in CoCr2O4

G. Lawes,1 B. Melot,2 K. Page,2 C. Ederer,2 M. A. Hayward,3 Th. Proffen,4 and R. Seshadri2 1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA 2Materials Department and Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA 3Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom 4Manuel Lujan, Jr. Neutron Scattering Center, Los Alamos National Laboratory, LANSCE-12, MS H805, Los Alamos, New Mexico 87545, USA Received 16 March 2006; revised manuscript received 25 May 2006; published 17 July 2006