Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7

Details Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7 Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7

2008-02-05

arxiv.org/abs/0802.0713v1

Phys. REv. Lett. 100, 247203 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.247203

The laminar perovskite Ca3Ru2O7 naturally forms ferromagnetic double-layers of alternating moment directions, as in the spin-valve superlattices. The mechanism of huge magnetoresistive effect in the material has been controversial due to a lack of clear understanding of various magnetic phases and phase-transitions. In this neutron diffraction study in a magnetic field, we identify four different magnetic phases in Ca3Ru2O7 and determine all first-order and second-order phase transitions between them. The spin-valve mechanism then readily explains the dominant magnetoresistive effect in Ca3Ru2O7.

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