{"_buckets": {"deposit": "871f4fe3-fca1-4181-9b45-9f0225ea6e5f"}, "_deposit": {"id": "2007010", "owners": [1], "pid": {"revision_id": 0, "type": "depid", "value": "2007010"}, "status": "published"}, "_oai": {"id": "oai:u-ryukyu.repo.nii.ac.jp:02007010", "sets": ["1642838003490", "1642838406414"]}, "author_link": [], "item_1617186331708": {"attribute_name": "Title", "attribute_value_mlt": [{"subitem_1551255647225": "Constant Coupling Approximations to Anisotropic Heisenberg Model", "subitem_1551255648112": "en"}]}, "item_1617186419668": {"attribute_name": "Creator", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Matayoshi, Seitaro", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "Shinjo, Tsuneo", "creatorNameLang": "en"}]}, {"creatorNames": [{"creatorName": "\u53c8\u5409, \u6e05\u592a\u90ce", "creatorNameLang": "ja"}]}, {"creatorNames": [{"creatorName": "\u65b0\u57ce, \u6052\u592b", "creatorNameLang": "ja"}]}]}, "item_1617186476635": {"attribute_name": "Access Rights", "attribute_value_mlt": [{"subitem_1522299639480": "open access", "subitem_1600958577026": "http://purl.org/coar/access_right/c_abf2"}]}, "item_1617186626617": {"attribute_name": "Description", "attribute_value_mlt": [{"subitem_description": "The Curie points T_c (\u03bc) as the function of anisotropic interaction parameter \u03bc are calculated by both the constant coupling and the improved constant coupling approximations. T_c (\u03bc) by these approximations decrease, as the parameter \u03bc increases, with similar tendencies on the whole. Especially in two dimensional system, the Curie points become T_c = 0 and dT_c/d\u03bc= infinity at \u03bc= 1. The short range orders are investigated to understand the physical meaning of the sudden change in the neighbourhood of \u03bc= 1. The effect of the second neighbour anisotropic exchange interaction on the curie point is studied by two approximations mentioned above. It is obtained that the occurrence of the order in this anisotropic system is enhanced if the second neighbour exchange interaction parameter is ferromagnetic, and is suppressed if antiferromagnetic, as in the isotropic system. The Curie points calculated by these two approximations are in contradiction to the rigorous theory in the isotropic low dimensional systems. Discussions are given how to overcome the faults In these approximate methods. It is carried out to extend the theorem due to Mermin and Wagner into the anisotropic Heisenberg model with finite range interactions.", "subitem_description_type": "Other"}, {"subitem_description": "\u7d00\u8981\u8ad6\u6587", "subitem_description_type": "Other"}]}, "item_1617186643794": {"attribute_name": "Publisher", "attribute_value_mlt": [{"subitem_1522300295150": "ja", "subitem_1522300316516": "\u7409\u7403\u5927\u5b66\u7406\u5de5\u5b66\u90e8"}, {"subitem_1522300295150": "en", "subitem_1522300316516": "Science and Engineering Division, University of the Ryukyus"}]}, "item_1617186702042": {"attribute_name": "Language", "attribute_value_mlt": [{"subitem_1551255818386": "jpn"}]}, "item_1617186783814": {"attribute_name": "Identifier", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/20.500.12000/23673"}]}, "item_1617186920753": {"attribute_name": "Source Identifier", "attribute_value_mlt": [{"subitem_1522646500366": "NCID", "subitem_1522646572813": "AN0025080X"}]}, "item_1617186941041": {"attribute_name": "Source Title", "attribute_value_mlt": [{"subitem_1522650068558": "ja", "subitem_1522650091861": "\u7409\u7403\u5927\u5b66\u7406\u5de5\u5b66\u90e8\u7d00\u8981. \u7406\u5b66\u7de8"}, {"subitem_1522650068558": "en", "subitem_1522650091861": "Bulletin of Science \u0026 Engineering Division, University of Ryukyus.   Mathematics \u0026 natural sciences"}]}, "item_1617187056579": {"attribute_name": "Bibliographic Information", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1979-03", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "27", "bibliographicPageEnd": "38", "bibliographicPageStart": "19"}]}, "item_1617258105262": {"attribute_name": "Resource Type", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_1617265215918": {"attribute_name": "Version Type", "attribute_value_mlt": [{"subitem_1522305645492": "NA", "subitem_1600292170262": "http://purl.org/coar/version/c_be7fb7dd8ff6fe43"}]}, "item_1617605131499": {"attribute_name": "File", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_access", "download_preview_message": "", "file_order": 0, "filename": "No27p019.pdf", "future_date_message": "", "is_thumbnail": false, "mimetype": "", "size": 0, "url": {"objectType": "fulltext", "url": "https://u-ryukyu.repo.nii.ac.jp/record/2007010/files/No27p019.pdf"}, "version_id": "0d450abe-160c-43b9-888e-7ba9e4750e07"}]}, "item_title": "Constant Coupling Approximations to Anisotropic Heisenberg Model", "item_type_id": "15", "owner": "1", "path": ["1642838003490", "1642838406414"], "permalink_uri": "http://hdl.handle.net/20.500.12000/23673", "pubdate": {"attribute_name": "PubDate", "attribute_value": "2012-03-05"}, "publish_date": "2012-03-05", "publish_status": "0", "recid": "2007010", "relation": {}, "relation_version_is_last": true, "title": ["Constant Coupling Approximations to Anisotropic Heisenberg Model"], "weko_shared_id": -1}