Model for the low-temperature magnetic phases observed in doped YBa{sub 2}Cu{sub 3}O{sub 6+x}
Journal Article
·
· Physical Review, B: Condensed Matter
- Condensed Matter Physics and Chemistry Department, Riso/ National Laboratory, DK-4000 Roskilde (Denmark)
- Landau Institute for Theoretical Physics, Chernogolovka, 142432 Moscow District (Russia)
A classical statistical model for the {ital antiferromagnetic} ordering of the Cu spins in the CuO{sub 2} planes of reduced YBa{sub 2}Cu{sub 3}O{sub 6+x}-type materials is presented. The magnetic phases considered are the experimentally observed high-temperature antiferromagnetic (AFI) phase with ordering vector {bold Q}{sub I}=((1)/(2)(1)/(2)0), and the low-temperature phases: antiferromagnetic (AFII) with {bold Q}{sub II}=((1)/(2)(1)/(2)(1)/(2)) and intermediate Turn-Angle (TA) phases TAI, TAII, and TAIII with components of both ordering vectors. It is shown that the AFII and TA phases result from an effective {ital ferromagnetic}-type coupling mediated by free spins in the CuO{sub x} basal plane. Good agreement with experimental data is obtained for realistic model parameters. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544910
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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