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

doi:10.1007/s11664-004-0157-z

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 journal › Article › peer-review

1 Scopus citations

Abstract

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 language	English
Pages (from-to)	1303-1307
Number of pages	5
Journal	Journal of Electronic Materials
Volume	33
Issue number	11
DOIs	https://doi.org/10.1007/s11664-004-0157-z
State	Published - 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.

Keywords

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

Access to Document

10.1007/s11664-004-0157-z

Cite this

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title = "Destruction of an orbitally ordered and spin-Polarized state: Colossal magnetoresistance in Ca3Ru2O7",

abstract = "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.",

keywords = "Colossal magnetoresistance (CMR), Orbital ordering, Spin polarization",

author = "G. Cao and L. Balicas and Lin, {X. N.} and S. Chikara and E. Elhami and V. Duairaj and Brill, {J. W.} and Rai, {R. C.} and Crow, {J. E.}",

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.",

year = "2004",

month = nov,

doi = "10.1007/s11664-004-0157-z",

language = "English",

volume = "33",

pages = "1303--1307",

number = "11",

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T1 - Destruction of an orbitally ordered and spin-Polarized state

T2 - Colossal magnetoresistance in Ca3Ru2O7

AU - Cao, G.

AU - Balicas, L.

AU - Lin, X. N.

AU - Chikara, S.

AU - Elhami, E.

AU - Duairaj, V.

AU - Brill, J. W.

AU - Rai, R. C.

AU - Crow, J. E.

N1 - 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.

PY - 2004/11

Y1 - 2004/11

N2 - 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.

AB - 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.

KW - Colossal magnetoresistance (CMR)

KW - Orbital ordering

KW - Spin polarization

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