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Title: Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2

Abstract

Magnetic-susceptibility {chi}({ital T}) and neutron-diffraction studies on single-crystal specimens of Sr{sub 2}CuO{sub 2}Cl{sub 2} are reported. A three-dimensional antiferromagnetic structure similar to that in La{sub 2}CuO{sub 4} is identified below the Neel temperature {ital T}{sub {ital N}}=251{plus minus}5 K by neutron diffraction, with an ordered moment {mu}(10 K)=0.34{plus minus}0.04 {mu}{sub {ital B}}/Cu aligned along the (110) crystal direction. This moment is comparable to those for La{sub 2}CuO{sub 4} samples with similar {ital T}{sub {ital N}}. No structural transition from the tetragonal {ital I}4/{ital mmm} space group is observed between 10 and 300 K. The {chi}({ital T}) near {ital T}{sub {ital N}} is consistent with the tetragonal structure, showing no evidence for the peak at {ital T}{sub {ital N}} seen in orthorhombic La{sub 2}CuO{sub 4}, arising from the Dzyaloshinsky-Moriya interaction, which is absent without the orthorhombic distortion. Above {ital T}{sub {ital N}} the exchange coupling constant {ital J} between adjacent Cu ions is evaluated from {chi}({ital T}) and found to be essentially identical to that in La{sub 2}CuO{sub 4}. The anisotropic Cu spin and Van Vleck susceptibilities are also estimated from the analysis.

Authors:
;  [1]; ; ;  [2]
  1. Exxon Research and Engineering Company, Annandale, New Jersey 08801 (US)
  2. Ames Laboratory and Department of Physics, Iowa State University, Ames, Iowa 50011 (USA)
Publication Date:
OSTI Identifier:
7008595
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 41:4; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPPER CHLORIDES; PHYSICAL PROPERTIES; COPPER OXIDES; STRONTIUM CHLORIDES; STRONTIUM OXIDES; ANISOTROPY; ANTIFERROMAGNETISM; CRYSTAL STRUCTURE; LOW TEMPERATURE; MAGNETIC SUSCEPTIBILITY; MEDIUM TEMPERATURE; MONOCRYSTALS; NEUTRON DIFFRACTION; TEMPERATURE DEPENDENCE; TETRAGONAL LATTICES; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHLORIDES; CHLORINE COMPOUNDS; COHERENT SCATTERING; COPPER COMPOUNDS; COPPER HALIDES; CRYSTAL LATTICES; CRYSTALS; DIFFRACTION; HALIDES; HALOGEN COMPOUNDS; MAGNETIC PROPERTIES; MAGNETISM; OXIDES; OXYGEN COMPOUNDS; SCATTERING; STRONTIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Vaknin, D, Sinha, S K, Stassis, C, Miller, L L, and Johnston, D C. Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2. United States: N. p., 1990. Web. doi:10.1103/PhysRevB.41.1926.
Vaknin, D, Sinha, S K, Stassis, C, Miller, L L, & Johnston, D C. Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2. United States. doi:10.1103/PhysRevB.41.1926.
Vaknin, D, Sinha, S K, Stassis, C, Miller, L L, and Johnston, D C. Thu . "Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2". United States. doi:10.1103/PhysRevB.41.1926.
@article{osti_7008595,
title = {Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2},
author = {Vaknin, D and Sinha, S K and Stassis, C and Miller, L L and Johnston, D C},
abstractNote = {Magnetic-susceptibility {chi}({ital T}) and neutron-diffraction studies on single-crystal specimens of Sr{sub 2}CuO{sub 2}Cl{sub 2} are reported. A three-dimensional antiferromagnetic structure similar to that in La{sub 2}CuO{sub 4} is identified below the Neel temperature {ital T}{sub {ital N}}=251{plus minus}5 K by neutron diffraction, with an ordered moment {mu}(10 K)=0.34{plus minus}0.04 {mu}{sub {ital B}}/Cu aligned along the (110) crystal direction. This moment is comparable to those for La{sub 2}CuO{sub 4} samples with similar {ital T}{sub {ital N}}. No structural transition from the tetragonal {ital I}4/{ital mmm} space group is observed between 10 and 300 K. The {chi}({ital T}) near {ital T}{sub {ital N}} is consistent with the tetragonal structure, showing no evidence for the peak at {ital T}{sub {ital N}} seen in orthorhombic La{sub 2}CuO{sub 4}, arising from the Dzyaloshinsky-Moriya interaction, which is absent without the orthorhombic distortion. Above {ital T}{sub {ital N}} the exchange coupling constant {ital J} between adjacent Cu ions is evaluated from {chi}({ital T}) and found to be essentially identical to that in La{sub 2}CuO{sub 4}. The anisotropic Cu spin and Van Vleck susceptibilities are also estimated from the analysis.},
doi = {10.1103/PhysRevB.41.1926},
journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 41:4,
place = {United States},
year = {1990},
month = {2}
}