Effective field theory for layered quantum antiferromagnets with nonmagnetic impurities

Journal Article · Tue Feb 01 00:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.R3772· OSTI ID:20215490

Chen, Yu-Chang ^[1]; Castro Neto, A H ^[1]

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1. Department of Physics, University of California, Riverside, California 92521 (United States)

We propose an effective two-dimensional quantum nonlinear sigma model combined with classical percolation theory to study the magnetic properties of site diluted layered quantum antiferromagnets such as La{sub 2}Cu{sub 1-x}M{sub x}O{sub 4} (M=Zn,Mg). We calculate the staggered magnetization at zero temperature, M{sub s}(x), the magnetic correlation length, {xi}(x,T), the NMR relaxation rate, 1/T{sub 1}(x,T), and the Neel temperature, T{sub N}(x), in the renormalized classical regime. Due to quantum fluctuations we find a quantum critical point at x{sub c}{approx_equal}0.305 at lower doping than the two-dimensional percolation threshold x{sub p}{approx_equal}0.41. We compare our results with the available experimental data. (c) 2000 The American Physical Society.

• OSTI ID: 20215490
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 6; Other Information: PBD: 1 Feb 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
IMPURITIES
ANTIFERROMAGNETIC MATERIALS
QUANTUM FIELD THEORY
MAGNETIZATION
NEEL TEMPERATURE
NMR SPECTRA
RELAXATION
MAGNETIC PROPERTIES
LANTHANUM OXIDES
MAGNESIUM OXIDES
ZINC OXIDES
COPPER OXIDES
TEMPERATURE ZERO K
EXPERIMENTAL DATA
THEORETICAL DATA