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Spin-glass behavior and incommensurate modulation in high-pressure perovskite BiCr0.5Ni0.5O3
Ángel M Arévalo-López1, Antonio J Dos Santos-García, Jessica R Levin
1Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh , Edinburgh EH9 3JZ, United Kingdom.
Abstract:
The BiCr(0.5)Ni(0.5)O(3) perovskite has been obtained at high pressure. Neutron and synchrotron diffraction data show a Pnma orthorhombic structure with a = 5.5947(1) Å, b = 7.7613(1) Å, and c = 5.3882(1) Å at 300 K and random B-site Cr/Ni distribution. Electron diffraction reveals an incommensurate modulation parallel to the b axis. The combination of either Cr-O-Ni (J > 0) or Cr-O-Cr/Ni-O-Ni (J < 0) nearest-neighbor spin interactions results in a random-bond spin-glass configuration. Magnetization, neutron diffraction, and muon-spin-relaxation measurements demonstrate that variations in the local bonding and charge states contribute to the magnetic frustration.
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