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Fernández, M. T.
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article
Magnetic behavior of ErCrO4 oxide
Abstract
<p>ErCrO<sub>4</sub> has been synthesized as a single phase by the nitrate precursor method under an oxygen flow at 753 K. The structure of this compound has been refined from X-ray and neutron powder diffraction data, showing the zircon-type structure, S.G. I4<sub>1</sub>/amd and lattice parameters a=7.062(1) Å, c=6.201(3) Å. Magnetic susceptibility and magnetization measurements reveal the existence of incipient ferromagnetic interactions in the Cr<sup>5+</sup> sublattice below 25 K. When the temperature decreases, the superexchange Er<sup>3+</sup>-O-Cr<sup>5+</sup>-O-Er<sup>3+</sup> antiferromagnetic interactions become predominant. The estimated Néel temperature is 15 K. A metamagnetic transition has been detected at the critical field of 375 Oe. Neutron diffraction data show a three-dimensional antiferromagnetic ordering in which both Cr<sup>5+</sup> and Er<sup>3+</sup> sublattices are involved. Such ordering takes place with a propagation vector k=[0].</p>