Crossover from positive to negative magnetoresistance in a spinel

Dinah R Parker; Mark A Green; Steven T Bramwell; Andrew S Wills; Jason S Gardner; Dan A Neumann

doi:10.1021/ja036965a

Crossover from positive to negative magnetoresistance in a spinel

J Am Chem Soc. 2004 Mar 10;126(9):2710-1. doi: 10.1021/ja036965a.

Authors

Dinah R Parker¹, Mark A Green, Steven T Bramwell, Andrew S Wills, Jason S Gardner, Dan A Neumann

Affiliation

¹ The Royal Institution of Great Britain, and Department of Chemistry, University College London, UK.

PMID: 14995182
DOI: 10.1021/ja036965a

Abstract

We present a new class of colossal magnetoresistance materials based on a series of frustrated spinels. The spin glass-like compound Zn0.95Cu0.05Cr2Se4, shows a field-induced transition to a ferromagnetic, which is associated with a highly unusual negative magnetoresistance effect (MR > 80%) in low magnetic field. At higher temperatures there is an unprecedented crossover to positive magnetoresistance (MR > 50%).