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23 April 2024

» arxiv » cond-mat/0307068

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Field-tuned Collapse of an Orbital Ordered and Spin-polarized State: Colossal Magnetoresistance in Bilayered Ruthenate
G. Cao ; L. Balicas ; X. N. Lin ; S. Chikara ; V. Duairaj ; E. Elhami ; J.W. Brill ; R.C. Rai ;
Date:	3 Jul 2003
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	Ca3Ru2O7 with a Mott-like transition at 48 K features different in-plane anisotropies of magnetization and magnetoresistance. Applying magnetic field along the magnetic easy-axis precipitates a spin-polarized state via a first-order metamagnetic transition, but does not lead to a full suppression of the Mott state, whereas applying magnetic field along the magnetic hard axis does, causing a resistivity reduction of three orders of magnitude. The colossal magnetoresistivity is attributed to the collapse of the orbital ordered and spin-polarized state. Evidence for a density wave is also presented.
Source:	arXiv, cond-mat/0307068
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