Structures, spin glass and spin states in perovskite GdMn/sub x/Co/sub 1-x/O/sub 3/ (x /spl les/ 0.5)

Authors

M Mehdi Farhoudi, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow

RIS ID

25199

Publication Details

This paper originally appeared as: Farhoudi, MM and Wang, XL, Structures, spin glass and spin states in perovskite GdMn/sub x/Co/sub 1-x/O/sub 3/ (x /spl les/ 0.5), INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 4-8 April 2005, 1679-1680. Copyright IEEE 2005.

Abstract

The structures, ferromagnetism, spin glass and spin states of Co and Mn in a polycrystalline ceramic samples of GdCo/sub 1-x/Mn/sub x/O/sub 3/ (x = 0.2, 0.3, 0.4, 0.5) are presented. X-ray diffraction show that all the samples are single phase and crystallize as orthorhombic structures and that the lattice parameters gradually increase with x. Spin glass state and two peak features (corresponding to first order ferromagnetic and second order transition) in dc and ac susceptibility are observed. Curie-Wise fitting on the inverse susceptibility-temperature plots indicates that the valences of Co or Mn changed from 2+ or 4+ to 3+ when Co amount increases. Possible spin state transformation of Co and Mn is also suggested.