Field-tuned collapse of an orbitally ordered and spin-polarized state: Colossal magnetoresistance in the bilayered ruthenate Ca3Ru2O7

G. Cao, L. Balicas, X. N. Lin, S. Chikara, E. Elhami, V. Duairaj, J. W. Brill, R. C. Rai, J. E. Crow

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Ca3Ru2O7 with a Mott-like transition at 48 K and a Néel temperature at 56 K features different in-plane anisotropies of the magnetization and magnetoresistance. Applying a 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 a 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 an orbitally ordered and spin-polarized state. This phenomenon is striking in that the spin polarization, which is a fundamental driving force for all other magnetoresistive systems, is detrimental to the colossal magnetoresistence in this 4d-based electron system. Evidence of a density wave is also presented.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number1
DOIs
StatePublished - Jan 8 2004

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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