Magnetic structure, magnetoelastic coupling, and thermal properties of EuCrO3 nanopowders

Article

关键词: EXCHANGE INTERACTIONS;    WEAK-FERROMAGNETISM;    CRITICAL EXPONENTS;    SINGLE-CRYSTAL;    DIFFRACTION;    CHROMITES;    HEAT;    SUPEREXCHANGE;    SCATTERING;   

DOI  :  10.1103/PhysRevB.93.104414

来源: SCIE

【 摘 要 】

We carried out detailed studies of the magnetic structure, magnetoelastic coupling, and thermal properties of EuCrO3 nanopowders from room temperature to liquid helium temperature. Our neutron powder diffraction and x-ray powder diffraction measurements provide precise atomic positions of all atoms in the cell, especially for the light oxygen atoms. The low-temperature neutron powder diffraction data revealed extra Bragg peaks of magnetic origin, which can be attributed to a G(x) antiferromagnetic structure with an ordered moment of similar to 2.4 mu(B) consistent with the 3d(3) electronic configuration of the Cr3+ cations. Apart from previously reported antiferromagnetic and ferromagnetic transitions in EuCrO3 at low temperatures, we also observed an anomaly at about 100 K. This anomaly was observed in the temperature dependence of the sample's, lattice parameters, thermal expansion, Raman spectroscopy, permittivity, and conductance measurements. This anomaly is attributed to the magnetoelastic distortion in the EuCrO3 crystal.

【 授权许可】

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