Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7

Wei Bao; Z. Q. Mao; Z. Qu; J. W. Lynn

doi:10.1103/PhysRevLett.100.247203

Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7

Strongly Correlated Electrons 2008-06-27 v1

Authors: Wei Bao , Z. Q. Mao , Z. Qu , J. W. Lynn

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Abstract

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.

Keywords

perovskite magnetism frustrated magnetism magnetoresistance

Cite

@article{arxiv.0802.0713,
  title  = {Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7},
  author = {Wei Bao and Z. Q. Mao and Z. Qu and J. W. Lynn},
  journal= {arXiv preprint arXiv:0802.0713},
  year   = {2008}
}

Comments

4 pages, 5 figures

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