Robustness of Antiferromagnetism and Pyroelectricity in AgCr 1-x Rh x S 2

E. Pachoud (1) , F. Damay (2) , Christine Martin (1) , N.E. Mordvinova (1) , O.I. Lebedev (1) , A. Maignan (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 LLB - UMR 12 - Laboratoire Léon Brillouin

The effect of the rhodium for chromium substitution in AgCr 1-x Rh x S 2 on the magnetic and dielectric properties has been studied in the 0.0 ≤ x ≤ 0.5 range. It is found that the antiferromagnetic transition temperature T N decreases as x increases by about -0.9 K per %Rh up to x = 0.30. Consequently, the peak temperature in the real part of the dielectric permittivity, associated with T N , is observed to decrease by the same amount. Moreover, the electrical polarization magnitude induced below T N in this pyroelectric sulfide tends to decrease with x increasing. This is consistent with the structural study showing the random character of the substitution, which creates both magnetic dilution and more symmetric local structure. These two factors are expected to hinder the magnetoelastic effect supposed to be responsible for the electrical polarization change in AgCrS 2 at T N . © 2016 American Chemical Society.

Keywords: Antiferromagnetism; Crystallography; Dielectric properties; Permittivity; Polarization; Antiferromagnetic transition temperature; Dielectric permittivities; Electrical polarization; Magnetic and dielectric properties; Magnetoelastic effects; Peak temperatures; Random characters; Structural studies; Rhodium; Magnetic properties; Quantum mechanics; Chemical structure; Cations

Domains: Chemical Sciences; Cristallography; Theoretical and/or physical chemistry; Material chemistry

E. Pachoud, F. Damay, Christine Martin, N.E. Mordvinova, O.I. Lebedev, et al.. Robustness of Antiferromagnetism and Pyroelectricity in AgCr 1-x Rh x S 2. Chemistry of Materials, 2016, 28 (6), pp.1816-1822. ⟨10.1021/acs.chemmater.5b04948⟩. ⟨hal-02184722⟩