Antiferromagnetism in Sr sub 2 CuO sub 2 Cl sub 2

Journal Article · Thu Feb 01 00:00:00 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), Vol. 41:4; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
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STRONTIUM OXIDES
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ANTIFERROMAGNETISM
CRYSTAL STRUCTURE
LOW TEMPERATURE
MAGNETIC SUSCEPTIBILITY
MEDIUM TEMPERATURE
MONOCRYSTALS
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TETRAGONAL LATTICES
ULTRALOW TEMPERATURE
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ALKALINE EARTH METAL COMPOUNDS
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COPPER HALIDES
CRYSTAL LATTICES
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HALIDES
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