{"id":9734,"date":"2018-03-09T00:15:11","date_gmt":"2018-03-09T00:15:11","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/2018\/03\/09\/magnetoestriccion-e-irreversibilidades-en-intermetalicos-de-tierras-raras-con-anisotropa%c2%ada-magnetica-aleatoria-y-en-superconductores-de-alta-tc\/"},"modified":"2018-03-09T00:15:11","modified_gmt":"2018-03-09T00:15:11","slug":"magnetoestriccion-e-irreversibilidades-en-intermetalicos-de-tierras-raras-con-anisotropa%c2%ada-magnetica-aleatoria-y-en-superconductores-de-alta-tc","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/magnetoestriccion-e-irreversibilidades-en-intermetalicos-de-tierras-raras-con-anisotropa%c2%ada-magnetica-aleatoria-y-en-superconductores-de-alta-tc\/","title":{"rendered":"Magnetoestricci\u00f3n e irreversibilidades en intermet\u00e1licos de tierras raras con anisotrop\u00edamagn\u00e9tica aleatoria y en superconductores de alta tc"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Cesar De La Fuente Del Rey <\/strong><\/h2>\n<p>&#8211; un diagrama de fases magneticas ha sido propuesto para los intermetalicos a-tb2fexni1-x (0    x    1) a partir de medidas de  ac inicial. En el se limitan las fases:  paramagnetica y dos esperimagneticas. Tambien se han realizado medidas de imanacion, m y magnetoestriccion anisotropa,  t, hasta 12 t y del excelente ajuste conseguido con las predicciones con un modelo de propuesto ha sido posible obtener los valores de los parametros de canje, j, de cec aleatorio, d, y magnetoelastico, m2. El cociente d\/j indica que la anisotropia magnetica aleatoria (rma) es muy intensa.  &#8211; se ha determinado a partir de medidas de  ac inicial el parametro de orden de edwards-anderson, q, para intermetalicos tbxy1-xal2 (0.15   x  0.25). Se ha definido y obtenido un nuevo parametro de orden,  , relacionado con la irreversibilidad que presentan estos sistemas. El calculo teorico de la variacion de q y con la temperatura, concuerda adecuadamente con el experimento. Ademas se ha obtenido el cociente d\/j que indica la debilidad de la rma, para estos compuestos.  &#8211; hemos probado que para los intermetalicos tbxy1-xal2 (0.27   x   1) con rma debil, la ley de akulov m3 no se cumple, adoptando la forma  t mp con p p inferior a 3.  este comportamiento es consecuencia del defecto cuantico de la imanacion a ok, debido a la rma.  &#8211; en estos compuestos intermetalicos a-(gd1-xtbx)2 cu (0 x  1) y a-tb2fe con rma intensa se han realizado medidas de relajacion de la imanacion remanente a distintas temperaturas, cuya dependencia termica se ha interpretado a traves de mecanismos de activacion termica y de efecto tunel cuantico de la imanacion.  &#8211; se han realizado medidas de magnetoestriccion en el modo de deformacion  ( , ),  ( , ) y  ( , ) en compuestos superconductores de alta temperatura critica trba2cu3o7-x (tr = ho, dy y er), de los que hemos podido deducir la coexistencia de dos mecanismos: paraestriccion, cuyo origen esta en el campo cristalino, y, por o<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnetoestricci\u00f3n e irreversibilidades en intermet\u00e1licos de tierras raras con anisotrop\u00edamagn\u00e9tica aleatoria y en superconductores de alta tc<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnetoestricci\u00f3n e irreversibilidades en intermet\u00e1licos de tierras raras con anisotrop\u00edamagn\u00e9tica aleatoria y en superconductores de alta tc <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Cesar De La Fuente Del Rey <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Zaragoza<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 18\/12\/1995<\/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>Agustin Del Moral Gamiz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: fernando Palacio parada <\/li>\n<li>marcos Tejedor gancedo (vocal)<\/li>\n<li>am\u00edlcar Labarta rodr\u00edguez (vocal)<\/li>\n<li>felix Vidal costa (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Cesar De La Fuente Del Rey &#8211; un diagrama de fases magneticas ha sido propuesto para los [&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":[199,1008,1007,13610],"tags":[1010,33086,33085,2789,28761,745],"class_list":["post-9734","post","type-post","status-publish","format-standard","hentry","category-fisica","category-fisica-del-estado-solido","category-propiedades-magneticas-de-los-solidos","category-zaragoza","tag-agustin-del-moral-gamiz","tag-amilcar-labarta-rodriguez","tag-cesar-de-la-fuente-del-rey","tag-felix-vidal-costa","tag-fernando-palacio-parada","tag-marcos-tejedor-gancedo"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/9734","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=9734"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/9734\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=9734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=9734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=9734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}