Mössbauer study of CuFe 0.7 Cr 1.3 <mml:math xmlns:mml="…
1989; American Physical Society; Volume: 40; Issue: 1 Linguagem: Inglês
10.1103/physrevb.40.84
ISSN1095-3795
AutoresHand Nam Ok, Kyung Seon Baek, Eun Jung Choi,
Tópico(s)Multiferroics and related materials
ResumoFerrimagnetic ${\mathrm{CuFe}}_{0.7}$${\mathrm{Cr}}_{1.3}$${\mathrm{O}}_{4}$ has been investigated over a temperature range from 4.2 to 347 K using the M\"ossbauer technique. X-ray diffraction shows that it has a cubic spinel structure and a lattice constant of ${a}_{0}$=8.346\ifmmode\pm\else\textpm\fi{}0.005 A\r{}. The isomer shift indicates that iron ions are ferric and located at the tetrahedral sites. Its N\'eel temperature ${T}_{N}$ is found to be 343\ifmmode\pm\else\textpm\fi{}2 K. As the temperature increases toward ${T}_{N}$ a systematic line broadening effect in the M\"ossbauer spectrum is observed and interpreted to originate from different temperature dependencies of the magnetic hyperfine fields at various iron sites.
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