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KO50001004-00210085-0001.pdf
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:722.7 KB
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| Title |
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Green function theory of ferromagnetism
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| Creator |
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福地, 充
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フクチ, ミツル
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Fukuchi, Mitsuru
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Associate Professor, Faculty of Engineering, Keio University
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椎木, 一夫
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シイキ, カズオ
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Shiiki, Kazuo
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Student, Faculty of Engineering, Keio University
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慶応義塾大学藤原記念工学部
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| Kana |
ケイオウ ギジュク ダイガク フジワラ キネン コウガクブ
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| Romanization |
Keio gijuku daigaku Fujiwara kinen kogakubu
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| Date |
| Issued (from:yyyy) |
1968
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Proceedings of the Fujihara Memorial Faculty of Engineering Keio University
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慶応義塾大学藤原記念工学部研究報告
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21
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| Issue |
85
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| Year |
1968
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| Start page |
89(1)
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106(18)
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| Abstract |
Theory of ferromagnetism in Heisenberg model is investigated by Green function method. In low temperature region, the Green function appropriate to Dyson Hamiltonian and its Hermitian adjoint one is worked out by means of series expansion for the mass operator of the Green function. The behaviour of a ferromagnet in wider temperature range has been worked out using the original Hamiltonian in spin operators by means of the various decoupling approximations. They are criticized and their degrees of approximation and the merits and demerits are considered mainly from the criterion of microscopic view-ponit and are expressed in a table.
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| Departmental Bulletin Paper
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