Quantum critical behavior in a two-layer antiferromagnet

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.16483· OSTI ID:55101

Sandvik, A W ^[1]; Chubukov, A V ^[2]; Sachdev, S ^[3]

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1. National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32306 (United States)
2. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
3. Department of Physics, P.O. Box 208120, Yale University, New Haven, Connecticut 06520-8120 (United States)

We analyze quantum Monte Carlo data in the vicinity of the quantum transition between a Neel state and a quantum paramagnet in a two-layer, square-lattice spin-1/2 Heisenberg antiferromagnet. The real-space correlation function and the universal amplitude ratio of the structure factor and the dynamic susceptibility show clear evidence of quantum critical behavior at low temperatures. The numerical results are in good quantitative agreement with 1/{ital N} calculations for the {ital O}({ital N}) nonlinear {sigma} model. A discrepancy, reported earlier, between the critical properties of the antiferromagnet and the {sigma} model is resolved. We also discuss the values of prefactors of the dynamic susceptibility and the structure factor in a single-layer antiferromagnet at low {ital T}.

• DOE Contract Number: FG03-85ER45197
• OSTI ID: 55101
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
CRITICALITY
HEISENBERG MODEL
MONTE CARLO METHOD
NEEL TEMPERATURE
PARAMAGNETISM
PHASE TRANSFORMATIONS