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Title: Stacking of the square-lattice antiferromagnetic planes in Ca{sub 2}CuO{sub 2}Cl{sub 2}

Abstract

Single-crystal neutron elastic and quasielastic scattering and magnetization studies of the spin-(1)/(2) square-lattice Heisenberg antiferromagnet Ca{sub 2}CuO{sub 2}Cl{sub 2} indicate an unusual stacking of the antiferromagnetic planes in the N{acute e}el state (T{sub N}=247{plus_minus}5K) which is different from the collinear stacking in isostructural Sr{sub 2}CuO{sub 2}Cl{sub 2}. A generalized magnetic model is presented to describe the data. Elastic scattering along the ((1)/(2)(1)/(2)l) rod is observed above T{sub N}, suggesting that the CuO{sub 2} planes, although uncoupled, maintain some degree of two-dimensional order up to a crossover temperature (T{sub co}{approx}280 K) to the isotropic Heisenberg state. No structural phase transition from the I4/mmm symmetry was observed in the temperature range 10{endash}300 K. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
; ;  [1]
  1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
Publication Date:
Research Org.:
Ames National Laboratory
OSTI Identifier:
632618
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 56; Journal Issue: 13; Other Information: PBD: Oct 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM OXIDES; ANTIFERROMAGNETISM; MAGNETIZATION; CRYSTAL-PHASE TRANSFORMATIONS; COPPER OXIDES; CALCIUM CHLORIDES; COPPER CHLORIDES; STACKING FAULTS; ANTIFERROMAGNETIC MATERIALS; NEEL TEMPERATURE; NEUTRON DIFFRACTION; HEISENBERG MODEL

Citation Formats

Vaknin, D, Miller, L L, and Zarestky, J L. Stacking of the square-lattice antiferromagnetic planes in Ca{sub 2}CuO{sub 2}Cl{sub 2}. United States: N. p., 1997. Web. doi:10.1103/PhysRevB.56.8351.
Vaknin, D, Miller, L L, & Zarestky, J L. Stacking of the square-lattice antiferromagnetic planes in Ca{sub 2}CuO{sub 2}Cl{sub 2}. United States. doi:10.1103/PhysRevB.56.8351.
Vaknin, D, Miller, L L, and Zarestky, J L. Wed . "Stacking of the square-lattice antiferromagnetic planes in Ca{sub 2}CuO{sub 2}Cl{sub 2}". United States. doi:10.1103/PhysRevB.56.8351.
@article{osti_632618,
title = {Stacking of the square-lattice antiferromagnetic planes in Ca{sub 2}CuO{sub 2}Cl{sub 2}},
author = {Vaknin, D and Miller, L L and Zarestky, J L},
abstractNote = {Single-crystal neutron elastic and quasielastic scattering and magnetization studies of the spin-(1)/(2) square-lattice Heisenberg antiferromagnet Ca{sub 2}CuO{sub 2}Cl{sub 2} indicate an unusual stacking of the antiferromagnetic planes in the N{acute e}el state (T{sub N}=247{plus_minus}5K) which is different from the collinear stacking in isostructural Sr{sub 2}CuO{sub 2}Cl{sub 2}. A generalized magnetic model is presented to describe the data. Elastic scattering along the ((1)/(2)(1)/(2)l) rod is observed above T{sub N}, suggesting that the CuO{sub 2} planes, although uncoupled, maintain some degree of two-dimensional order up to a crossover temperature (T{sub co}{approx}280 K) to the isotropic Heisenberg state. No structural phase transition from the I4/mmm symmetry was observed in the temperature range 10{endash}300 K. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.56.8351},
journal = {Physical Review, B: Condensed Matter},
number = 13,
volume = 56,
place = {United States},
year = {1997},
month = {10}
}