Local distortions in multiferroic AgCrO2 triangular spin lattice
authors Lopes, AML; Oliveira, GNP; Mendonca, TM; Moreira, JA; Almeida, A; Araujo, JP; Amaral, VS; Correia, JG
nationality International
journal PHYSICAL REVIEW B
keywords DELAFOSSITE OXIDES ABO(2); RELAXATION; ORDERS; PAC; FE; AG; CU; CR; ND
abstract In this work an electric-field gradient and magnetic hyperfine field study of the multiferroic AgCrO2 triangular spin lattice is presented. Perturbed angular correlation measurements at different temperatures, revealed the coexistence of two electric-field gradients, i.e., two distinct local environments at temperatures below 100 K. The emerging second local environment appears as a distortion of the Cr surrounding resulting in a local symmetry lowering. This local distortion emerges much above T-N and concomitantly with the onset of short-range magnetic correlations. We claim that, through a magnetoelastic instability, distinct Cr-Cr exchange interaction pathways appear providing a channel for magnetic frustration release.
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2011
volume 84
issue 1
digital object identifier (doi) 10.1103/PhysRevB.84.014434
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000293302400009

Apoio

1suponsers_list_ciceco.jpg