{"id":12774,"date":"2016-12-16T14:28:03","date_gmt":"2016-12-16T13:28:03","guid":{"rendered":"http:\/\/aktuelles.uni-frankfurt.de\/?p=12774"},"modified":"2023-02-23T16:50:53","modified_gmt":"2023-02-23T15:50:53","slug":"fundamental-solid-state-phenomenon-unravelled","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/fundamental-solid-state-phenomenon-unravelled\/","title":{"rendered":"Fundamental solid state phenomenon unravelled"},"content":{"rendered":"<figure class=\"wp-block-image alignleft is-resized wp-image-11209\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/12\/blog_Mott-Uebergang-Lang.jpg\" alt=\"Elektronen vor dem Hintergrund des Atomgitters \u2013 die Bestandteile eines Festk\u00f6rpers. Die gegenseitige Absto\u00dfung der Elektronen sorgt daf\u00fcr, dass sie engen Kontakt vermeiden. Dies behindert den Elektronenfluss, und das System kann zu einem Isolator werden. Grafik: Ulrich Tutsch\" class=\"wp-image-11209\" width=\"369\" height=\"255\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/12\/blog_Mott-Uebergang-Lang.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2016\/12\/blog_Mott-Uebergang-Lang-300x208.jpg 300w\" sizes=\"(max-width: 369px) 100vw, 369px\" \/><figcaption class=\"wp-element-caption\">Grafik: Ulrich Tutsch<\/figcaption><\/figure>\n\n\n\n<p>Whether water freezes to ice, iron is demagnetized or a material becomes superconducting \u2013 for physicists there is always a phase transition behind it. They endeavour to understand these different phenomena by searching for universal properties.<\/p>\n\n\n\n<p>Researchers at Goethe University Frankfurt and Technische Universit\u00e4t Dresden have now made a pioneering discovery during their study of a phase transition from an electrical conductor to an insulator (Mott metal-insulator transition).<\/p>\n\n\n\n<p>According to Sir Nevill Francis Mott\u2019s prediction in 1937, the mutual repulsion of charged electrons, which are responsible for carrying electrical current, can cause a metal-insulator transition. Yet, contrary to common textbook opinion, according to which the phase transition is determined solely by the electrons, it is the interaction of the electrons with the atomic lattice of the solid which is the determinant factor. The researchers have reported this in the latest issue of the \u201cScience Advances\u201d journal.<\/p>\n\n\n\n<p>The research group, led by <a href=\"https:\/\/www.uni-frankfurt.de\/46940353\/AG_Lang\" target=\"_blank\" rel=\"noopener\">Professor Michael Lang of the Physics Institute<\/a> at Goethe University Frankfurt, succeeded in making the discovery with the help of a homemade apparatus which is unique worldwide. It allows the measurement of length changes at low temperatures under variable external pressure with extremely high resolution. In this way, it was possible to prove experimentally for the first time that it is not just the electrons which play a significant role in the phase transition but also the atomic lattice &#8211; the solid\u2019s scaffold.<\/p>\n\n\n\n<p>\u201cThese experimental results will herald in a paradigm shift in our understanding of one of the key phenomena of current condensed matter research\u201d, says Professor Lang. The Mott metal-insulator transition is namely linked to unusual phenomena, such as high-temperature superconductivity in copper oxide-based materials. These offer tremendous potential for future technical applications.<\/p>\n\n\n\n<p>The theoretical analysis of the experimental findings is based on the fundamental notion that the many particles in a system close to a phase transition not only interact with their immediate neighbours but also \u201ccommunicate\u201d over long distances with all other particles. As a consequence, only overarching aspects are important, such as the system\u2019s symmetry. The identification of such universal properties is thus the key to understanding phase transitions.<\/p>\n\n\n\n<p>\u201cThese new insights open up a whole new perspective on the Mott metal-insulator transition and permit more sophisticated theoretical modelling of the phase transition\u201d, explains Dr. Markus Garst, Senior Lecturer at the Institute of Theoretical Physics of Technische Universit\u00e4t Dresden.<\/p>\n\n\n\n<p>The research work was funded by the German Research Foundation in the framework of the Collaborative Research Centre\/Transregio \u201cCondensed Matter Systems with Variable Many-Body Interactions\u201d led by Professor Michael Lang.<\/p>\n\n\n<p><strong>Publication:<\/strong><\/p>\n<p>Elena Gati, Markus Garst, Rudra S. Manna, Ulrich Tutsch, Bernd Wolf, Lorenz Bartosch, Harald Schubert, Takahiko Sasaki, John A. Schlueter, and Michael Lang, Breakdown of Hooke\u2019s law of elasticity at the Mott critical endpoint in an organic conductor, Science Advances 2, e1601646 (2016).<\/p>\n<p>Caption: Electrons embedded in the atomic lattice \u2013 the components of a solid. The mutual repulsion of the electrons prevents them from coming into close contact. This impedes the electron flow and the system can become an insulator (originator: Dr. Ulrich Tutsch)<\/p>\n\n\n\n<p><em><strong>Source: <a href=\"http:\/\/www.goethe-university-frankfurt.de\/64793486\/45\" target=\"_blank\" rel=\"noopener\">Press Release 16\/12\/16<\/a><\/strong><\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Whether water freezes to ice, iron is demagnetized or a material becomes superconducting \u2013 for physicists there is always a phase transition behind it. They endeavour to understand these different [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":11209,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-12774","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fundamental solid state phenomenon unravelled | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/fundamental-solid-state-phenomenon-unravelled\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fundamental solid state phenomenon unravelled | Aktuelles aus der Goethe-Universit\u00e4t Frankfurt\" \/>\n<meta property=\"og:description\" content=\"Whether water freezes to ice, iron is demagnetized or a material becomes superconducting \u2013 for physicists there is always a phase transition behind it. 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