Infinite-range quantum random Heisenberg magnet

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We study with exact diagonalization techniques the Heisenberg model for a system of SU(2) spins with (formula presented) and random infinite-range exchange interactions. We calculate the critical temperature (formula presented) for the spin-glass to paramagnetic transition. We obtain (formula presen...

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Autores principales: Arrachea, L., Rozenberg, M.J.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10980121_v65_n22_p1_Arrachea
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10980121_v65_n22_p1_Arrachea
record_format dspace
spelling todo:paper_10980121_v65_n22_p1_Arrachea2023-10-03T16:05:44Z Infinite-range quantum random Heisenberg magnet Arrachea, L. Rozenberg, M.J. We study with exact diagonalization techniques the Heisenberg model for a system of SU(2) spins with (formula presented) and random infinite-range exchange interactions. We calculate the critical temperature (formula presented) for the spin-glass to paramagnetic transition. We obtain (formula presented) 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 (formula presented) at (formula presented) and analyze their evolution as T increases. We also calculate the specific heat (formula presented) We find that it displays a smooth maximum at (formula presented) in good qualitative agreement with experiments. We argue that the fact that (formula presented) is due to a quantum disorder effect. © 2002 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v65_n22_p1_Arrachea
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We study with exact diagonalization techniques the Heisenberg model for a system of SU(2) spins with (formula presented) and random infinite-range exchange interactions. We calculate the critical temperature (formula presented) for the spin-glass to paramagnetic transition. We obtain (formula presented) 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 (formula presented) at (formula presented) and analyze their evolution as T increases. We also calculate the specific heat (formula presented) We find that it displays a smooth maximum at (formula presented) in good qualitative agreement with experiments. We argue that the fact that (formula presented) is due to a quantum disorder effect. © 2002 The American Physical Society.
format JOUR
author Arrachea, L.
Rozenberg, M.J.
spellingShingle Arrachea, L.
Rozenberg, M.J.
Infinite-range quantum random Heisenberg magnet
author_facet Arrachea, L.
Rozenberg, M.J.
author_sort Arrachea, L.
title Infinite-range quantum random Heisenberg magnet
title_short Infinite-range quantum random Heisenberg magnet
title_full Infinite-range quantum random Heisenberg magnet
title_fullStr Infinite-range quantum random Heisenberg magnet
title_full_unstemmed Infinite-range quantum random Heisenberg magnet
title_sort infinite-range quantum random heisenberg magnet
url http://hdl.handle.net/20.500.12110/paper_10980121_v65_n22_p1_Arrachea
work_keys_str_mv AT arracheal infiniterangequantumrandomheisenbergmagnet
AT rozenbergmj infiniterangequantumrandomheisenbergmagnet
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