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Title of Journal: Nuov Cim B

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Abbravation: Il Nuovo Cimento B (1971-1996)

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Società Italiana di Fisica

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DOI

10.1016/0963-9969(95)00009-7

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1826-9877

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The Spin1÷2 Heisenberg ferromagnet via anticommut

Authors: J O Lawson S J Brient
Publish Date: 2008/05/07
Volume: 15, Issue: 1, Pages: 25-32
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Abstract

The spin1/2 Heisenberg ferromagnet is analysed via anticommutator Green’s functions The generated secondorder Green’s functions are linearized via Tyablikov decoupling The resulting normalized magnetization as a function of temperature utilizing a modified Coulomb approximation for the exchange integral and a firstorder Fermi approximation iteratively is found to reproduce the Weiss molecularfield resultsАнализируется ферро магнетик Гайзенберг а со спином 1/2 с помощью гриновских функций а нтикоммутатора Обра зованные функции Грина второг о порядка линеаризуют ся через нарушение св язи Тябликова Используя повторно модифицированное ку лоновское приближен ие для обменного интеграла и приближение Ферми первого порядк а получается что резу льтирующая нормированная намагниченность как функция температуры воспроизводит резул ьтаты для молекулярн ого поля ВейссаSi analizza il ferromagnete di Heisenberg di spin 1/2 tramite le funzioni di Green degli anticommutatori Le funzioni di Green del secondo ordine generate sono rese lineari tramite il disaccoppiamento di Tyablikov Si trova che la magnetizzazione normalizzata risultante in funzione della temperatura è in grado di riprodurre i risultati del campo molecolare di Weiss utilizzando un’approssimazione di Coulomb modiflcata per l’intégrale di scambio ed un’approssimazione di Fermi del primo ordine

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