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Arrachea, L.; Rozenberg, M.J. "Infinite-range quantum random Heisenberg magnet" (2002) Physical Review B - Condensed Matter and Materials Physics. 65(22):2244301-22443011
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Abstract:

We study with exact diagonalization techniques the Heisenberg model for a system of SU(2) spins with S=1/2 and random infinite-range exchange interactions. We calculate the critical temperature Tg for the spin-glass to paramagnetic transition. We obtain Tg≈0.13, in good agreement with previous quantum Monte Carlo and analytical estimates. We provide a detailed picture for the different kind of excitations which intervene in the dynamical response Χ″(ω,T) at T=0 and analyze their evolution as T increases. We also calculate the specific heat Cv(T). We find that it displays a smooth maximum at TM≈0.25, in good qualitative agreement with experiments. We argue that the fact that TM>Tg is due to a quantum disorder effect.

Registro:

Documento: Artículo
Título:Infinite-range quantum random Heisenberg magnet
Autor:Arrachea, L.; Rozenberg, M.J.
Filiación:Departamento de Fisica, FCEyN Universidad de Buenos Aires, Pabellon I, Ciudad Universitaria, (1428) Buenos Aires, Argentina
Palabras clave:glass; acceleration; article; calculation; magnet; mathematical analysis; model; Monte Carlo method; quantum mechanics
Año:2002
Volumen:65
Número:22
Página de inicio:2244301
Página de fin:22443011
DOI: http://dx.doi.org/10.1103/PhysRevB.65.224430
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:01631829
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v65_n22_p2244301_Arrachea

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Citas:

---------- APA ----------
Arrachea, L. & Rozenberg, M.J. (2002) . Infinite-range quantum random Heisenberg magnet. Physical Review B - Condensed Matter and Materials Physics, 65(22), 2244301-22443011.
http://dx.doi.org/10.1103/PhysRevB.65.224430
---------- CHICAGO ----------
Arrachea, L., Rozenberg, M.J. "Infinite-range quantum random Heisenberg magnet" . Physical Review B - Condensed Matter and Materials Physics 65, no. 22 (2002) : 2244301-22443011.
http://dx.doi.org/10.1103/PhysRevB.65.224430
---------- MLA ----------
Arrachea, L., Rozenberg, M.J. "Infinite-range quantum random Heisenberg magnet" . Physical Review B - Condensed Matter and Materials Physics, vol. 65, no. 22, 2002, pp. 2244301-22443011.
http://dx.doi.org/10.1103/PhysRevB.65.224430
---------- VANCOUVER ----------
Arrachea, L., Rozenberg, M.J. Infinite-range quantum random Heisenberg magnet. Phys. Rev. B Condens. Matter Mater. Phys. 2002;65(22):2244301-22443011.
http://dx.doi.org/10.1103/PhysRevB.65.224430