1. Study on a non-diluted insulating spin glass Fe_xMn_<1-x>TiO_3: Susceptibility

Abstract

Since the pioneering studies by Cannella and Mydosh, and by Edwards and Anderson, many experimental and theoretical investigations have been done on spin glasses which are formed in spin systems in which ferromagnetic and antiferromagnetic exchange interactions are randomly distributed. Experimentally the low field susceptibility shows a sharp cusp at a low temperature Tg, indicating that the local spins are frozen randomly in direction. On the other hand, the specific heat does not exhibit any evidence for a phase transition at Tg, and no long-range order has been observed by neutron scattering measurement. These features have been observed widely in dilute magnetic alloys in which the long-range RKKY interaction dominates and also in insulating compounds in which the nearest-neighbor exchange interaction does.