Antiferromagnetic phase breakdown of a randomly decorated Heisenberg model: Application to La{sub 2{minus}x}Ba{sub x}CuO{sub 3} (abstract)
- International Center of Condensed Matter Physics, Universidade de Brasilia, 70919-970, Brasilia-DF (Brazil)
- Laboratorio de Fisica Teorica e Computacional, Universidade Federal de Pernambuco, 50670-901, Recife-PE (Brazil)
The quenched decorated Ising model with competitive interactions recently introduced by Fittipaldi is herein extended to the Heisenberg case. The model consists of planes in which the nodal spins interact antiferromagnetically (J{lt}0) with their nearest neighbors, and ferromagnetically (K{gt}0) with the spins that decorate the bonds, which are quenched randomly distributed over the lattice. The planes, which simulate the CuO{sub 2} layers in doped cuprates superconducting materials, interact antiferromagnetically (J{sup {prime}}={lambda}J). By using the framework of an effective-field theory with correlations, we discuss the 3D antiferromagnetic-phase stability limit in the temperature-decorated bond concentration space (T{minus}p), for various values of both interplane and intraplane exchange parameters {lambda} and {alpha}={vert_bar}J{vert_bar}/K, respectively. In particular, our numerical estimates of the vanishing temperature critical concentrations p{sub c} [i.e., p{sub c} at which T{sub N}(p{sub c})=0] well compare with the experimental data of Kitaoka {ital et al.} for the La{sub 2{minus}x}Ba{sub x}CuO{sub 4} in the nonsuperconducting phase. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 554275
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 98:000882
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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