Blume-Emery-Griffiths spin glass and inverted tricritical points.
The Blume-Emery-Griffiths spin glass is studied by renormalization-group theory in d=3 . The boundary between the ferromagnetic and paramagnetic phases has first-order and two types of second-order segments. This topology includes an inverted tricritical point, first-order transitions replacing second-order transitions as temperature is lowered. The phase diagrams show disconnected spin-glass regions, spin-glass and paramagnetic reentrances, and complete reentrance, where the spin-glass phase replaces the ferromagnet as temperature is lowered for all chemical potentials.
Department of Physics, Istanbul Technical University, Maslak 34469, Istanbul, Turkey.
V Ongun
VO
Ozçelik
A Nihat
AN
Berker