18 research outputs found
A method of determination of the thermal diffusivity of refractory powders in the 400?1200�K range
Fe-induced enhancement of antiferromagnetic spin correlations in Mn2-xFexBO4
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала
Fe-induced enhancement of antiferromagnetic spin correlation in Mn2-xFexBO4
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Fe substitution effect on the magnetic behavior of Mn2 xFexBO4 (x = 0.3, 0.5, 0.7) warwickites has been
investigated combining Mössbauer spectroscopy, dc magnetization, ac magnetic susceptibility, and heat
capacity measurements. The Fe3+ ions distribution over two crystallographic nonequivalent sites is studied.
The Fe introduction breaks a long-range antiferromagnetic order and leads to onset of spin-glass
ground state. The antiferromagnetic short-range-order spin correlations persist up to temperatures well
above TSG reflecting in increasing deviations from the Curie-Weiss law, the reduced effective magnetic
moment and ‘‘missing” entropy. The results are interpreted in the terms of the progressive increase of
the frustration effect and the formation of spin-correlated regions