Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.1926· OSTI ID:7008595

Vaknin, D; Sinha, S K ^[1]; Stassis, C; Miller, L L; Johnston, D C ^[2]

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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)

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.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7008595
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:4; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
ANTIFERROMAGNETISM
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
COPPER CHLORIDES
COPPER COMPOUNDS
COPPER HALIDES
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
HALIDES
HALOGEN COMPOUNDS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MEDIUM TEMPERATURE
MONOCRYSTALS
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM CHLORIDES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE