Random frustration in a two-dimensional spin-1/2 Heisenberg antiferromagnet

Journal Article · Wed Feb 01 00:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.3616· OSTI ID:6599668

Rodriguez, J P ^[1]; Bonca, J ^[2]; Ferrer, J ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

The square-lattice spin-1/2 antiferromagnet containing a dilute concentration [delta] of randomly placed ferromagnetic nearest-neighbor bonds is studied at low-temperature via nonlinear [sigma]-model techniques and by exact diagonalization. We generally find that long-range Neel order is destroyed above a critical strength in the defective ferromagnetic exchange-coupling constant given by [vert bar][ital K][sub [ital c]][vert bar]/[ital J][similar to][delta][sup [minus]1/2]. We also observe large statistical fluctuations both in the spin stiffness and in the antiferromagnetic structure factor near this critical point, suggesting the onset of a spin-glass phase.

• OSTI ID: 6599668
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 51:6; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
HEISENBERG MODEL
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
SIGMA MODEL
STRUCTURE FACTORS
TWO-DIMENSIONAL CALCULATIONS
BOSON-EXCHANGE MODELS
CRYSTAL MODELS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
PARTICLE MODELS
PERIPHERAL MODELS
SUPERCONDUCTORS
VARIATIONS
665400* - Quantum Physics Aspects of Condensed Matter- (1992-)