{"id":1052,"date":"2019-04-30T10:31:21","date_gmt":"2019-04-30T08:31:21","guid":{"rendered":"http:\/\/websrv.saske.sk\/uef\/en\/?page_id=1052"},"modified":"2019-04-30T12:36:41","modified_gmt":"2019-04-30T10:36:41","slug":"research","status":"publish","type":"page","link":"https:\/\/websrv.saske.sk\/uef\/en\/departments\/centre-of-low-temperature-physics\/research\/","title":{"rendered":"Research"},"content":{"rendered":"<div class=\"page-left\">\n<div class=\"post-content\">\n<p>The activities of the departement are concentrated on\u00a0<strong>solid state physics and quantum\u00a0 liquids at low and very low temperatures<\/strong>. Since 1990 a rebuilt\u00a0nuclear demagnetization apparatus\u00a0with the new diffusion welded copper nuclear stage is able\u00a0<strong>to cool superfluid\u00a0<sup>3<\/sup>He below 1 mK<\/strong>. The NMR technique was installed to study the magnetic properties of superfluid\u00a0<sup>3<\/sup>He (by homogeneously precessing domain). Special computer-controled current sources for supplying superconducting magnets used\u00a0 during\u00a0 the\u00a0 demagnetization process and during cw-NMR experiments were developped. The ultra low temperature group has cooperated with the people from The Kapitza Institute of Physical Problems, Moscow.<br \/>\nThe research in solid state physics is focused on\u00a0<strong>the study of the transport, thermal, magnetic and optical properties<\/strong>. The\u00a0<strong><sup>3<\/sup>He-<sup>4<\/sup>He dilution refrigerator<\/strong>\u00a0with a top\u00a0 loading\u00a0 system from Oxford Instruments enables performances\u00a0down\u00a0 to\u00a0 milikelvin temperatures. Here the main interest is devoted to the rare-earth intermetallic compounds\u00a0and\u00a0heavy fermions\u00a0(cooperation with Uni in Beyreuth). Simultaneously fast response\u00a0 secondary thermometers for low temperatures are developed. Several cryostats for measurements of the above mentioned\u00a0 properties at higher temperatures are available.<br \/>\nFrom 1983 a new solid state method \u2013\u00a0<strong>the point-contact spectroscopy<\/strong>\u00a0is used. This method is capable of recording directly\u00a0the electron-quasiparticle interaction in\u00a0 metals\u00a0 and\u00a0 intermetallic compounds. An interaction of the conduction electrons with\u00a0 phonons, magnetic excitons and\u00a0 paramagnons\u00a0 has\u00a0 been\u00a0 measured\u00a0 in\u00a0 many compounds in the lab. By\u00a0 this method the\u00a0<strong>direct observation of Zeeman splitting of crystal-electric-field levels<\/strong>\u00a0was done. The classical and quantum-mechanical trajectory effects have been studied in the point contacts of\u00a0 the semi-metals also in the high magnetic fields (cooperation with the Grenoble High Field Magnet Lab as well as with the Kharkov Institute of the Low Temp.Phys. and Engineering). At present,\u00a0<strong>the tunnel spectra of the high-T<sub>c<\/sub>\u00a0superconductors<\/strong>\u00a0(HTSC) are beeing studied.<br \/>\nOptical measurements are performed by the infrared spectrometer FT-IR 113v, Bruker working in the wave range from 10 up to 10000 cm<sup>-1<\/sup>\u00a0down to liqid helium temperatures. The main interest is devoted to\u00a0the high-T<sub>c<\/sub>superconductors,\u00a0the\u00a0 quasicrystalline\u00a0 materials\u00a0 and\u00a0the ferrofluids\u00a0(the study of small particle aggregation in magnetic fields). In\u00a0 progress\u00a0 are\u00a0 also\u00a0\u00a0 theoretical investigations of the point-contact and tunneling spectroscopy on heavy-fermion systems and HTSC, studies of\u00a0 excitations\u00a0 in the superfluid\u00a0<sup>3<\/sup>He. The departments He-liquifier supplies all interested laboratories in Ko\u0161ice.<\/p>\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/websrv.saske.sk\/uef-intranet-old\/files\/ofnt\/coldest_place.jpg\" alt=\"coldest_place.jpg\" width=\"449\" height=\"598\" \/><\/figure>\n<p style=\"text-align: center\"><strong>The coldest place in Central Europe<\/strong><\/p>\n<\/div>\n<\/div>\n<div class=\"page-right\">\n<div class=\"menu-departments_menu-container\"><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The activities of the departement are concentrated on\u00a0solid state physics and quantum\u00a0 liquids at low and very low temperatures. Since 1990 a rebuilt\u00a0nuclear demagnetization apparatus\u00a0with&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1041,"menu_order":95,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/pages\/1052"}],"collection":[{"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/comments?post=1052"}],"version-history":[{"count":5,"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/pages\/1052\/revisions"}],"predecessor-version":[{"id":1071,"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/pages\/1052\/revisions\/1071"}],"up":[{"embeddable":true,"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/pages\/1041"}],"wp:attachment":[{"href":"https:\/\/websrv.saske.sk\/uef\/en\/wp-json\/wp\/v2\/media?parent=1052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}