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Effect of interlayer coupling on Néel, temperature in copper oxide based antiferromagnets
Author(s) -
Patra S.,
Tripathi R. S.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221880222
Subject(s) - antiferromagnetism , decoupling (probability) , condensed matter physics , random phase approximation , copper , anisotropy , coupling constant , coupling (piping) , copper oxide , constant (computer programming) , oxide , materials science , physics , chemistry , quantum mechanics , metallurgy , control engineering , computer science , engineering , programming language
Abstract The role of interlayer coupling ( J ⟂ on the Néel temperature of (1–2–3) compounds is studied by taking the three‐dimensional anisotropic Heisenberg antiferromagnetic model. The two‐sublattice model of the antiferromagnet is considered. The double‐time Green function technique is employed and the higher‐order Green functions are decoupled using the Callen decoupling approximation. The Néel temperature ( T N ) for YBa 2 Cu 3 O 6+ x (1–2–3) compounds as a function of doping concentrations (x) is estimated. The intraplanar coupling strength ( J ‖ ) is treated as a constant throughout the numerical calculations. The theoretical results are compared with that of the random phase approximation (RPA) and existing experimental results.