{"id":83646,"date":"2000-03-03T00:00:00","date_gmt":"2000-03-03T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/hubbard-model-applied-to-the-electronic-structure-of-sr2ruo4-and-la2cuo4\/"},"modified":"2000-03-03T00:00:00","modified_gmt":"2000-03-03T00:00:00","slug":"hubbard-model-applied-to-the-electronic-structure-of-sr2ruo4-and-la2cuo4","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/hubbard-model-applied-to-the-electronic-structure-of-sr2ruo4-and-la2cuo4\/","title":{"rendered":"Hubbard model applied to the electronic structure of sr2ruo4 and la2cuo4."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Antonio P\u00e9rez Navarro <\/strong><\/h2>\n<p>El trabajo parte de una descripci\u00f3n de la transici\u00f3n mott-hubbard obtenida mediante teor\u00eda de perturbaciones a partir de un hamiltoniano de hubbard en dos dimensiones. Se calcula la autoenerg\u00eda en la aproximaci\u00f3n de fase aleatoria, utilizando una densidad de estados del sistema no interaccionante del tipo doble lorentziana. Se observa que el estado fundamental paramagn\u00e9tico es inestable para valores realistas de u: la autoenerg\u00eda viola una de las condiciones del teorema de luttinger y no se encuentra la transici\u00f3n mott-hubbard.  se resuelve el sistema en un estado antiferromagn\u00e9tico mediante una transformaci\u00f3n de bogolyuboy dentro de un campo medio de ondas de densidad de spin de vector de onda q=(), que soluciona las inconsistencia encontradas en el estado paramagn\u00e9tico.  para testear la autoenerg\u00eda obtenida en el estado paramagn\u00e9tico se calcula la estructura electr\u00f3nica del sr2ruo4. Seg\u00fan los resultados experimentales, este compuesto presenta fuerte correlaci\u00f3n en los estados de del ru. Se calcula la densidad de estados en la aproximaci\u00f3n de densidad local (lda), encontrando algunas diferencias con los datos experimentales. Dichos datos se pueden atribuir a la correlaci\u00f3n, que se incluye mediante un c\u00e1lculo lda+u, sin ninguna mejora, y mediante las autoenerg\u00edas obtenidas en el caso paramgn\u00e9tico, obteniendo un mayor acuerdo con los resultados experimentales.  la autoenerg\u00eda obtenida en el caso antiferromagn\u00e9tico se aplica entonces a la estructura electr\u00f3nica del la2cuo4. El c\u00e1lculo lda de este compuesto presenta un gran n\u00famero de estados en el nivel de fermi, y experimentalmente es un aislante.Atribuimos esta discrepancia a los efectos de la correlaci\u00f3n. el c\u00e1lculo lda+u no introduce ninguna mejora, por lo que se calcula la densidad de estados haciendo un cambio al estado fundamental antiferromagn\u00e9tico obtenido en la primera parte, incluyendo adem\u00e1s los efectos de la correspondiente autonerg\u00eda. El resultad<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Hubbard model applied to the electronic structure of sr2ruo4 and la2cuo4.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Hubbard model applied to the electronic structure of sr2ruo4 and la2cuo4. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Antonio P\u00e9rez Navarro <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 03\/03\/2000<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Joan Costa Quintana<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  Santiago Mu\u00f1oz dom\u00ednguez <\/li>\n<li> Garc\u00eda bach M\u00aa angeles (vocal)<\/li>\n<li>Fernando Flores sintas (vocal)<\/li>\n<li>Fernando L\u00f3pez aguilar (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Antonio P\u00e9rez Navarro El trabajo parte de una descripci\u00f3n de la transici\u00f3n mott-hubbard obtenida mediante teor\u00eda de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[987,2675,27766,14801,199,1008,9912,5437],"tags":[177156,28390,29395,177158,177157,29391],"class_list":["post-83646","post","type-post","status-publish","format-standard","hentry","category-electromagnetismo","category-electronica","category-estados-electronicos","category-estados-electronicos-en-los-solidos","category-fisica","category-fisica-del-estado-solido","category-superconductividad","category-superconductores","tag-antonio-perez-navarro","tag-fernando-flores-sintas","tag-fernando-lopez-aguilar","tag-garcia-bach-ma-angeles","tag-joan-costa-quintana","tag-juan-santiago-munoz-dominguez"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/83646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=83646"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/83646\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=83646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=83646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=83646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}