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Title: Magnetic states in frustrated bilayer models: The ordered phase of mixed-layer pnictide oxides

Abstract

We present results from a numerical investigation of bilayer classical spin systems with local interactions and frustration caused by lattice geometry. We find that when two identical square planes are displaced by half a lattice constant in one direction, a transition to a uniformly twisted spin state occurs at J/J{sub (perpendicular} {sub sign)}{>=}0.25. An orthogonal state between layers is obtained in the limit T=0 and J{sub (perpendicular} {sub sign)}=0. If instead the two layers are offset along a diagonal, we obtain the phase diagram of the classical J{sub 1}-J{sub 2} model. A weakly canted phase is observed at the classical transition point of J/J{sub (perpendicular} {sub sign)}=0.5, but frustration does not drive the system towards a state of orthogonal interlayer order. We propose a simple bilayer model with two inequivalent square lattices to study the frustrating interactions of the mixed layer pnictide oxides (Sr{sub 2}Mn{sub 3}Pn{sub 2}O{sub 2}, Pn=As,Sb). We find a ground state composed of two independent Neel ordered layers when the interlayer exchange is an order of magnitude weaker than the intralayer exchange, as suggested by experiment. Evidence for local orthogonal order between the layers is found, but it occurs in regions of parameter space which are notmore » experimentally realized. (c) 2000 The American Physical Society.« less

Authors:
 [1];  [2];  [1];  [3]
  1. Department of Physics, University of California, Davis, California 95616 (United States)
  2. (United States)
  3. Department of Chemistry, University of California, Davis, California 95616 (United States)
Publication Date:
OSTI Identifier:
20216576
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 21; Other Information: PBD: 1 Jun 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PNICTIDES; STRONTIUM OXIDES; MANGANESE OXIDES; ARSENIC OXIDES; ANTIMONY OXIDES; NEEL TEMPERATURE; ELECTRON EXCHANGE; LATTICE PARAMETERS; SPIN EXCHANGE; MAGNETIC PROPERTIES; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Enjalran, Matthew, Materials Research Institute, Lawrence Livermore National Laboratory, University of California, Livermore, California 94550, Scalettar, Richard T., and Kauzlarich, Susan M. Magnetic states in frustrated bilayer models: The ordered phase of mixed-layer pnictide oxides. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.14570.
Enjalran, Matthew, Materials Research Institute, Lawrence Livermore National Laboratory, University of California, Livermore, California 94550, Scalettar, Richard T., & Kauzlarich, Susan M. Magnetic states in frustrated bilayer models: The ordered phase of mixed-layer pnictide oxides. United States. doi:10.1103/PhysRevB.61.14570.
Enjalran, Matthew, Materials Research Institute, Lawrence Livermore National Laboratory, University of California, Livermore, California 94550, Scalettar, Richard T., and Kauzlarich, Susan M. Thu . "Magnetic states in frustrated bilayer models: The ordered phase of mixed-layer pnictide oxides". United States. doi:10.1103/PhysRevB.61.14570.
@article{osti_20216576,
title = {Magnetic states in frustrated bilayer models: The ordered phase of mixed-layer pnictide oxides},
author = {Enjalran, Matthew and Materials Research Institute, Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 and Scalettar, Richard T. and Kauzlarich, Susan M.},
abstractNote = {We present results from a numerical investigation of bilayer classical spin systems with local interactions and frustration caused by lattice geometry. We find that when two identical square planes are displaced by half a lattice constant in one direction, a transition to a uniformly twisted spin state occurs at J/J{sub (perpendicular} {sub sign)}{>=}0.25. An orthogonal state between layers is obtained in the limit T=0 and J{sub (perpendicular} {sub sign)}=0. If instead the two layers are offset along a diagonal, we obtain the phase diagram of the classical J{sub 1}-J{sub 2} model. A weakly canted phase is observed at the classical transition point of J/J{sub (perpendicular} {sub sign)}=0.5, but frustration does not drive the system towards a state of orthogonal interlayer order. We propose a simple bilayer model with two inequivalent square lattices to study the frustrating interactions of the mixed layer pnictide oxides (Sr{sub 2}Mn{sub 3}Pn{sub 2}O{sub 2}, Pn=As,Sb). We find a ground state composed of two independent Neel ordered layers when the interlayer exchange is an order of magnitude weaker than the intralayer exchange, as suggested by experiment. Evidence for local orthogonal order between the layers is found, but it occurs in regions of parameter space which are not experimentally realized. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.14570},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 21,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}