Destruction of an orbitally ordered and spin-Polarized state: Colossal magnetoresistance in 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


The Ca3Ru2O7 with a Mott-like transition at 48 K and a Neel temperature at 56 K features different in-plane anisotropies of magnetization and magnetoresistance. Applying the magnetic field along the magnetic easy axis precipitates a spin-polarized state via a first-order metamagnetic transition but does not lead to 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 a novel, orbitally ordered and spin-polarized state. This new phenomenon is striking in that the spin polarization, which is a fundamental driving force for all other magnetoresistive systems, is detrimental to the colossal magnetoresistance (CMR) in this 4d-based electron system. Evidence for a density wave is also presented.

Original languageEnglish
Pages (from-to)1303-1307
Number of pages5
JournalJournal of Electronic Materials
Issue number11
StatePublished - Nov 2004

Bibliographical note

Funding Information:
This work was supported by NSF Grant Nos. DMR-0240813 and DMR-0100572. One of the authors (GC) is grateful to Drs. Ganpathy Murthy and Elbio Dagotto for very helpful discussions.


  • Colossal magnetoresistance (CMR)
  • Orbital ordering
  • Spin polarization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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