{"id":1176,"date":"2015-06-02T09:12:33","date_gmt":"2015-06-02T13:12:33","guid":{"rendered":"https:\/\/techfragments.com\/?p=1176"},"modified":"2022-11-05T09:26:31","modified_gmt":"2022-11-05T13:26:31","slug":"iron-selenide-thin-films-for-high-temperature-superconductivity","status":"publish","type":"post","link":"https:\/\/techfragments.com\/iron-selenide-thin-films-for-high-temperature-superconductivity\/","title":{"rendered":"Iron Selenide Thin FilmsFor High-temperature Superconductivity"},"content":{"rendered":"

An atomically thin, high-temperature superconductor film has been created, by a research group at Tohoku University<\/a>, which has a superconducting transition temperature (Tc) of up to 60 K (-213\u00b0C).<\/p>\n

Superconductors are looked at as being among the most promising technologies for next-generation advanced electronic devices. This is because the special quantum effects in superconductors are a big advantage in getting ultrahigh-speed processing and energy savings.<\/p>\n

The group’s finding provides a perfect platform for investigating the mechanism of superconductivity in two-dimensional systems. It also opens a door to the development of next-generation nano-scale superconducting devices.<\/p>\n

In order to overcome the problems inherent in the device application of superconductors, namely achieving high-density integration of superconductors into electronic devices, not to mention the necessity of a huge and expensive cooling system utilizing liquid helium, due to the low Tc of conventional superconductors, the research team at Tohoku University turned its attention to iron selenide.<\/p>\n

Higher-Tc Superconductivity<\/h2>\n
\"Iron

Electrons are emitted from the surface by shinning ultraviolet light. The electronic structure of crystal is determined by measuring the energy and the emission angle of electrons.
Credit: Takashi Takahashi<\/p><\/div>\n

The team, led by Prof. Takashi Takahashi and Asst. Prof. Kosuke Nakayama, chose iron selenide (FeSe) since although the Tc of bulk FeSe is only 8 K (-265 \u00b0C), a signature of higher-Tc superconductivity has been suggested in ultrathin film and its verification has been urgently required.<\/p>\n

Initially, the researchers fabricated high-quality, atomically thin FeSe films, with thicknesses of between one monolayer (which corresponds to three-atoms thickness) and twenty monolayers (sixty-atoms thickness). They used the molecular-beam-epitaxy<\/a> (MBE) method.<\/p>\n

Next, they carefully investigated the electronic structure of grown films by angle-resolved photoemission spectroscopy<\/a> (ARPES).<\/p>\n

ARPES measurement revealed the opening of a superconducting gap at low temperatures, which is direct evidence of the emergence of superconductivity in the films. The researchers found that the Tc estimated from the gap-closing in a monolayer film is surprisingly high (above 60 K), which is about 8 times higher than the Tc of bulk FeSe.<\/p>\n

An ultrathin high-Tc superconductor would contribute to a meaningful down-sizing and resulting high-density integration in electric circuits, leading to the realization of future-generation electronic devices with high energy-saving and ultrahigh-speed operation.<\/p>\n

The present success in fabricating an atomically thin high-temperature superconductor not only provides an ideal platform to investigate the novel two-dimensional superconductivity, but also opens a route to developing an ultimate superconducting nano-device consisting of atomic-size electronic parts.<\/p>\n

Reference:<\/p>\n

Y. Miyata, K. Nakayama, K. Sugawara, T. Sato & T. Takahashi. High-temperature superconductivity in potassium-coated multilayer FeSe thin films<\/a>\u00a0 Nature Materials (2015) doi:10.1038\/nmat4302<\/p>\n","protected":false},"excerpt":{"rendered":"

An atomically thin, high-temperature superconductor film has been created, by a research group at Tohoku University, which has a superconducting transition temperature (Tc) of up to 60 K (-213\u00b0C). Superconductors are looked at as being among the most promising technologies for next-generation advanced electronic devices. This is because the special quantum effects in superconductors are…<\/p>\n","protected":false},"author":3,"featured_media":1179,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[78],"tags":[94],"_links":{"self":[{"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/posts\/1176"}],"collection":[{"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/comments?post=1176"}],"version-history":[{"count":3,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/posts\/1176\/revisions"}],"predecessor-version":[{"id":1182,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/posts\/1176\/revisions\/1182"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/media\/1179"}],"wp:attachment":[{"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/media?parent=1176"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/categories?post=1176"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techfragments.com\/wp-json\/wp\/v2\/tags?post=1176"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}