Quantum fluctuations in a disordered two-dimensional spin model

Journal Article · Thu Aug 01 00:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.3343· OSTI ID:286674

Gawiec, P; Grempel, D R ^[1]

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1. Commissariat a l`Energie Atomique, Departement de Recherche Fondamentale sur la Matiere Condensee, Service de Physique Statistique, Magnetisme et Supraconductivite, Centre d` Etudes Nucleaires de Grenoble, 17, rue des Martyrs, 38054 Grenoble Cedex 9 (France)

We study the effect of quantum fluctuations on the spin stiffness of a disordered two-dimensional anisotropic spin model within an 1/{ital S} expansion. We find that these fluctuations, very weak in the pure system, may be quite strong in the presence of bond disorder provided the latter introduces frustration in the system. As a consequence of the disorder-induced increase in the amplitude of zero-point fluctuations, the spin stiffness constant of the system vanishes in certain regions of parameter space, leading to the appearance of a spin-liquid phase in parts of the phase diagram where a spin-glass phase would be expected classically. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 286674
• Journal Information: Physical Review, B: Condensed Matter, Vol. 54, Issue 5; Other Information: PBD: Aug 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
SPIN GLASS STATE
ANTIFERROMAGNETISM
SPIN ORIENTATION
TWO-DIMENSIONAL CALCULATIONS
FLUCTUATIONS
ORDER-DISORDER MODEL
PHASE DIAGRAMS