{"_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"}, "item_5_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "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": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "We investigate the Hubbard\u2013Holstein 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\u2013phonon coupling g in the range gc1\u003cg\u003cgc2 for a fixed value of the Coulomb interaction U. As the result, the system shows a first-order phase transition at Tp(\u003cT 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\u003eTp, while it is single-well type for T\u003cTp. 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 \u03b2-pyrochlore oxide KOs2O6.", "subitem_description_type": "Abstract"}]}, "item_5_publisher_7": {"attribute_name": "\u51fa\u7248\u8005", "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": "\u8457\u8005\u7248\u30d5\u30e9\u30b0", "attribute_value_mlt": [{"subitem_select_item": "author"}]}, "item_5_source_id_11": {"attribute_name": "\u66f8\u8a8c\u30ec\u30b3\u30fc\u30c9ID", "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": "\u8457\u8005", "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": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2019-07-29"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "980.pdf", "filesize": [{"value": "130.5 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 130500.0, "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": "\u30ad\u30fc\u30ef\u30fc\u30c9", "attribute_value_mlt": [{"subitem_subject": "\u03b2-Pyrochlore oxide", "subitem_subject_scheme": "Other"}, {"subitem_subject": "KOs2O6", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Bipolaronic transition", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Hubbard\u2013Holstein model", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "A Possible Bipolaronic Transition in \u03b2-pyrochlore Compounds", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "A Possible Bipolaronic Transition in \u03b2-pyrochlore Compounds"}, {"subitem_title": "A Possible Bipolaronic Transition in \u03b2-pyrochlore Compounds", "subitem_title_language": "en"}]}, "item_type_id": "5", "owner": "1", "path": ["453/454", "176/488/489"], "permalink_uri": "http://hdl.handle.net/10191/26910", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_value": "2014-04-16"}, "publish_date": "2014-04-16", "publish_status": "0", "recid": "2256", "relation": {}, "relation_version_is_last": true, "title": ["A Possible Bipolaronic Transition in \u03b2-pyrochlore Compounds"], "weko_shared_id": null}