{"created":"2023-07-27T06:52:33.828780+00:00","id":46563,"links":{},"metadata":{"_buckets":{"deposit":"392cffa8-35c3-4b9c-977d-a88da14312d5"},"_deposit":{"created_by":18,"id":"46563","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"46563"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00046563","sets":["2812:2813:2829"]},"author_link":["2594","9908"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2005-03","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"19p.","bibliographicVolumeNumber":"2003-2004","bibliographic_titles":[{"bibliographic_title":"平成16(2004)年度 科学研究費補助金 基盤研究(C) 研究成果報告書"},{"bibliographic_title":"2004 Fiscal Year Final Research Report","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{},{},{},{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究において、MgB_2超伝導体に代表される多重ギャップ超伝導発現には複数フェルミ面が重要であるという観点から、複数バンドからなる複数フェルミ面がもたらす物性発現機構を理論的に探究することを主眼に研究を行った。本研究では、(1)超伝導における多重バンド効果のさらなる解明、(2)多重バンド効果による磁性発現の可能性、(3)有機分子性結晶における分子配向による多重バンド効果発現法則の探索、を行うことが目的である。この複数フェルミ面がもたらす新規な物性発現効果に対する理論的考察を行い、結晶構造の違いによる多重バンド効果の理論的予測を行った。\n超伝導発現における多重バンド効果では、多重バンド超伝導状態が単一バンド超伝導より安定化することが理論的に示された。この結果から超伝導転移温度の上昇が予測された。電子-格子相互作用による超伝導発現の場合、バンド間電子対トンネルが小さい場合は二つの異なる超伝導ギャップが存在し、バンド間対トンネルが大きい場合は区別が付かないことが示された。また、単一バンド理論の枠組みでは超伝導が発現する場合は有効電子間相互作用が引力で無ければならないが、フェルミ面が二つのバンドを横切る場合は斥力電子間相互作用でも超伝導発現することが示された。\n磁性における多重バンド効果では、二重バンド構造と磁性についての理論的考察を行った。単一バンド理論に相当するフェルミ面が1つのバンドを横切る場合は反強磁性的であるのに対し、フェルミ面が2つのバンドを横切る場合にはhalf-filling近傍で強磁性的になる可能性を示すことができた。\n有機分子性結晶の多くに見られるヘリーンボーン構造と二層正方格子構造についての物性発現予測を行った結果、二層正方格子構造では多重バンド効果により新規な磁性および超伝導性発現の可能性があることが示された。また、外場下での物性変化についても考察を行った。","subitem_description_type":"Abstract"},{"subitem_description":"Many bands play an important role of many gap superconductivity such as MgB_2 superconductor. Form viewpoint of the importance of many-band, we have theoretically investigated new physical properties such as superconducting gaps etc. arising from many-band. Our purposes of this project are (1) to investigate many-band effects on superconductivity, (2) to investigate many-band effects on magnetism and to discuss the possibility of new magnetic properties, and (3) to investigate many-band effects in molecular crystals. In this project, we have investigated many-band effects on superconductivity and magnetism by using Green's function techniques and some many-band models.\nIn many-band effects on superconductivity, we have obtained that the superconducting gap in namy-band systems becomes more stable than that of single band systems. The transition temperature for many-band superconductivity becomes higher than that of single band superconductivity. An effective two-electron pair scattering process between bands has a very important role to apper many-band superconductivity. We also have investigated a cooperative mechanism for superconductivity with the pair electron scattering process and the effective electron interactins from electron-phonon interaction. In a single band model such as BCS model, the effective electron interaction should be negative. However, In many-band systems, many-band superconductivity appears, even if the effective electron interaction becomes positive or negative.\nIn many-band effects on magnetism, we have found that effective electron-electron interaction becomes ferromagnetic at half-filling in many-band systems and that antiferromagnetic interaction appears by hole-doping into the many-band systems.\nWe have investigated magnetic and superconducting properties of herringbone and two-layer square lattices in organic crystals. In the two-layer square lattice, we have obtained that we can expect interesting magnetic properties by many-band effects and have also found the possibilities of many-band superconductivity in such two-layer lattices.","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:15550010, 研究期間(年度):2003-2004","subitem_description_type":"Other"},{"subitem_description":"出典：「分子性結晶構造と超伝導および磁性における多重バンド効果の関連性に関する理論的研究」研究成果報告書　課題番号15550010\n  (KAKEN：科学研究費助成事業データベース（国立情報学研究所）)\n　　　本文データは著者版報告書より作成","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00052895","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_17":{"attribute_name":"公開者","attribute_value_mlt":[{"subitem_publisher":"金沢大学理工研究域数物科学系"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/search/?qm=30291892"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=30291892","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15550010/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15550010/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-15550010/155500102004kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-15550010/155500102004kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-12-10"}],"displaytype":"detail","filename":"SC-PR-NAGAO-H-kaken 2005-19p.pdf","filesize":[{"value":"777.7 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"SC-PR-NAGAO-H-kaken 2005-19p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/46563/files/SC-PR-NAGAO-H-kaken 2005-19p.pdf"},"version_id":"738b7823-2548-495a-99cd-4409daec62d3"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"分子性結晶構造と超伝導および磁性における多重バンド効果の関連性に関する理論的研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"分子性結晶構造と超伝導および磁性における多重バンド効果の関連性に関する理論的研究"},{"subitem_title":"Theoretical studies on many-band effects on superconductivity and magnetism in molecular crystals","subitem_title_language":"en"}]},"item_type_id":"9","owner":"18","path":["2829"],"pubdate":{"attribute_name":"公開日","attribute_value":"2018-12-10"},"publish_date":"2018-12-10","publish_status":"0","recid":"46563","relation_version_is_last":true,"title":["分子性結晶構造と超伝導および磁性における多重バンド効果の関連性に関する理論的研究"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T14:28:53.376742+00:00"}