Integer spin-chain antiferromagnetism of the 4d oxide CaRuO3 with post-perovskite structure

Details Integer spin-chain antiferromagnetism of the 4d oxide CaRuO3 with post-perovskite structure Integer spin-chain antiferromagnetism of the 4d oxide CaRuO3 with post-perovskite structure

2011-04-07

arxiv.org/abs/1104.1461v1

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. B

Scientific paper

A quasi-one dimensional magnetism was discovered in the post-perovskite CaRuO3 (Ru4+: 4d4, Cmcm), which is iso-compositional with the perovskite CaRuO3 (Pbnm). An antiferromagnetic spin-chain function with -J/kB = 350 K well reproduces the experimental curve of the magnetic susceptibility vs. temperature, suggesting long-range antiferromagnetic correlations. The anisotropic magnetism is probably owing to the dyz - 2p- dzx and dzx - 2p- dyz superexchange bonds along a-axis. The Sommerfeld coefficient of the specific heat is fairly small, 0.16(2) mJ mol-1 K-2, indicating that the magnetism reflects localized nature of the 4d electrons. As far as we know, this is the first observation of an integer (S = 1) spin-chain antiferromagnetism in the 4d electron system.

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