{"created":"2021-03-01T06:05:57.351521+00:00","id":2256,"links":{},"metadata":{"_buckets":{"deposit":"b5cff8b2-ba6f-4911-94a3-3773c3304ba7"},"_deposit":{"id":"2256","owners":[],"pid":{"revision_id":0,"type":"depid","value":"2256"},"status":"published"},"_oai":{"id":"oai:niigata-u.repo.nii.ac.jp:00002256","sets":["176:488:489","453:454"]},"item_5_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-12","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"Supplement 1","bibliographicPageEnd":"S702","bibliographicPageStart":"S701","bibliographicVolumeNumber":"470","bibliographic_titles":[{"bibliographic_title":"Physica. C, Superconductivity and its applications"},{"bibliographic_title":"Physica. C, Superconductivity and its applications","bibliographic_titleLang":"en"}]}]},"item_5_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"We investigate the Hubbard–Holstein model by using the dynamical mean-field theory combined with the exact diagonalization method. Below a critical temperature Tcr, a coexistence of two solutions, small lattice fluctuating solution (polaronic state) and large one (bipolaronic state), is found for the same value of the electron–phonon coupling g in the range gc1<g<gc2 for a fixed value of the Coulomb interaction U. As the result, the system shows a first-order phase transition at Tp(<T cr) from the bipolaronic to the polaronic states as T decreases. The effective potential for oscillating atoms, which is renormalized due to the effect of g, is double-well type for T>Tp, while it is single-well type for T<Tp. The obtained transition for small U case with small Tp and discontinuities in physical quantities seems to be account for the rattling transition observed in the β-pyrochlore oxide KOs2O6.","subitem_description_type":"Abstract"}]},"item_5_publisher_7":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"Elsevier"}]},"item_5_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"info:doi/10.1016/j.physc.2010.01.022","subitem_relation_type_select":"DOI"}}]},"item_5_select_19":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"author"}]},"item_5_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AA11461984","subitem_source_identifier_type":"NCID"}]},"item_5_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"09214534","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Fuse, T."}],"nameIdentifiers":[{"nameIdentifier":"7659","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ono, Y."}],"nameIdentifiers":[{"nameIdentifier":"62","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-07-29"}],"displaytype":"detail","filename":"980.pdf","filesize":[{"value":"130.5 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"980.pdf","url":"https://niigata-u.repo.nii.ac.jp/record/2256/files/980.pdf"},"version_id":"78941693-08a5-4162-bb64-7e251cda22d0"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"β-Pyrochlore oxide","subitem_subject_scheme":"Other"},{"subitem_subject":"KOs2O6","subitem_subject_scheme":"Other"},{"subitem_subject":"Bipolaronic transition","subitem_subject_scheme":"Other"},{"subitem_subject":"Hubbard–Holstein model","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"A Possible Bipolaronic Transition in β-pyrochlore Compounds","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A Possible Bipolaronic Transition in β-pyrochlore Compounds"},{"subitem_title":"A Possible Bipolaronic Transition in β-pyrochlore Compounds","subitem_title_language":"en"}]},"item_type_id":"5","owner":"1","path":["454","489"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-04-16"},"publish_date":"2014-04-16","publish_status":"0","recid":"2256","relation_version_is_last":true,"title":["A Possible Bipolaronic Transition in β-pyrochlore Compounds"],"weko_creator_id":"1","weko_shared_id":null},"updated":"2022-12-15T03:35:08.025882+00:00"}