Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11

Details Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11 Two-Staged Magnetoresistance Driven by Ising-like Spin Sublattice in SrCo6O11

2007-04-23

arxiv.org/abs/0704.3025v2

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.217201

A two-staged, uniaxial magnetoresistive effect has been discovered in SrCo6O11 having a layered hexagonal structure. Conduction electrons and localized Ising spins are in different sublattices but their interpenetration makes the conduction electrons sensitively pick up the stepwise field-dependence of magnetization. The stepwise field-dependence suggests two competitive interlayer interactions between ferromagnetic Ising-spin layers, i.e., a ferromagnetic nearest-layer interaction and an antiferromagnetic next-nearest-layer interaction. This oxide offers a unique opportunity to study nontrivial interplay between conduction electrons and Ising spins, the coupling of which can be finely controlled by a magnetic field of a few Tesla.

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