The Blume-Emery-Griffiths Spin Glass and Inverted Tricritical Points

Details The Blume-Emery-Griffiths Spin Glass and Inverted Tricritical Points The Blume-Emery-Griffiths Spin Glass and Inverted Tricritical Points

2008-03-18

arxiv.org/abs/0803.2720v2

Phys. Rev. E 78, 031104 (2008)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Added discussion, references, and figure insets. 5 pages, 6 figures. Published version

Scientific paper

10.1103/PhysRevE.78.031104

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.

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