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Current issue

ELEKTRO 4/2019 was released on April 17th 2019. Its digital version will be available on May 13th 2019.

Topic: Topic: Electroinstallation; Smart buildings; IoT; HVAC; Security technology

Main Article
Smart Cities (part 9)

SVĚTLO (Light) 2/2019 was released on March 15th 2019. Its digital version will be available immediately.

Architectural and scenic lighting
The architectural lighting of Bečov nad Teplou castle
Lighting design in a nutshell – Part 41
The analyse of light picture a little more theoretic

Day light
Biggest mistakes in day lighting design of buildings

New record temperature for a superconductor

21.08.2015 | Ars Technica; Johannes Gutenberg University | www.arstechnica.com

Superconductivity was first seen in metals cooled down to close to absolute zero. But after exhausting every metal on the periodic table, the critical temperature at which the metal transitions to superconductivity never budged far from those extremely low temperatures.

That changed dramatically with the development of cuprate superconductors, copper-containing ceramics that could superconduct in liquid nitrogen - still very cold (138K or - 135°C), but relatively easy to achieve. But progress has stalled, in part because we don't have a solid theory to explain superconductivity in these materials.

New temperatures in superconductor

Now, taking advantage of the fact that we do understand what's going on in superconducting metals, a German research team has reached a new record critical temperature: 203K, or -70°C, a temperature that is sometimes seen in polar regions. The material they used, however, isn't a metal that appears on the periodic table. In fact, they're not even positive they know what the material is, just that it forms from hydrogen sulfide at extreme pressures.

Read more at Ars Technica

Image Credit: Brookhaven National Lab

-jk-