Spin correlations and magnetic field effects in the weakly anisotropic square-lattice antiferromagnet Sr{sub 2}CuO{sub 2}Cl{sub 2}

Journal Article · Mon Sep 11 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.2212· OSTI ID:239426

Suh, B J; Borsa, F; Miller, L L; Corti, M; Johnston, D C; Torgeson, D R ^[1]

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1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

{sup 35}Cl nuclear spin-lattice relaxation rate (NSLR) and magnetic susceptibility ({chi}) measurements are reported for Sr{sub 2}CuO{sub 2}Cl{sub 2} single crystals as functions of temperature and of magnetic field intensity and orientation. From the anisotropy of the {sup 35}Cl NSLR and {chi} we obtained evidence for a crossover of the Cu{sup 2+} spin correlations from Heisenberg to {ital XY}-like at {ital T}{approx}290 K. For H{parallel}{ital c} the 3D antiferromagnetic transition is at {ital T}{sub {ital N}}=257 K and is field independent while for H{parallel}{ital ab} {ital T}{sub {ital N}} increases to 265 K at {ital H}=8.2 T. The field-dependent {ital T}{sub {ital N}} for H{parallel}{ital ab} is explained by a field-induced Ising-like anisotropy in the {ital ab} plane.

• Research Organization: Ames National Laboratory
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 239426
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANISOTROPY
CHLORIDES
COPPER OXIDES
HEISENBERG MODEL
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MONOCRYSTALS
NUCLEAR MAGNETIC RESONANCE
PEROVSKITES
PHASE TRANSFORMATIONS
SPIN-LATTICE RELAXATION
STRONTIUM COMPOUNDS