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Quantum-Mechanically Induced Asymmetry in the Phase Diagrams of Spin-Glass Systems by Kaplan, C. Nadir; Berker, A. Nihat is a scholarly article available to read on EtoBox.

What is Quantum-Mechanically Induced Asymmetry in the Phase Diagrams of Spin-Glass Systems about?

The spin-1/2 quantum Heisenberg model is studied in all spatial dimensions d by renormalization-group theory. Strongly asymmetric phase diagrams in temperature and antiferromagnetic bond probability p are obtained in dimensions d \geq 3. The asymmetry at high temperatures approaching the pure ferromagnetic and antiferromagnetic systems disappears as d is increased. However, the asymmetry at low but finite temperatures remains in all dimensions, with the antiferromagnetic phase receding to the ferromagnetic phase. A finite-temperature second-order phase boundary directly between the ferromagnetic and antiferromagnetic phases occurs in d \geq 6, resulting in a new multicritical point at its meeting with the boundaries to the paramagnetic phase. In d=3,4,5, a paramagnetic phase reaching zero temperature intervenes asymmetrically between the ferromagnetic and reentrant antiferromagnetic phases. There is no spin-glass phase in any dimension.

Author

Kaplan, C. Nadir; Berker, A. Nihat

Published

2007

Language

EN