Russian physicists have synthesized a new generation of superconductors

Scientists from the Lebedev Physical Institute RAS (LPI) was synthesized for the first time in Russia a new type high-temperature superconducting materials based on iron, nickel and cobalt, which has great potential in engineering, said "LPI-Inform".   Until recently, the main class of high-temperature superconductors are cuprates — copper-based compounds. In 1993, Eugene Antipov Sergey Putilin from MSU got a mercury-based cuprate, in experiments which set a record temperature The superconducting transition state — 135 Kelvin (109 degrees below zero Celsius). However in 2008 opened a new class high temperature superconductors — iron based materials and pnictide (nitrogen, phosphorus, arsenic), or chalcogenides (oxygen, sulfur, Selenium,
tellurium, Polonium). New superconductors grown in the Department of High-Temperature Superconductivity LPI, are a family of 1-2-2 — a substance consisting of barium, iron and arsenic. They are easier than synthesis their "brothers" from other families and at the same data materials different interesting properties. "First, although it is family intensively studied, is still not fully understood mechanism electron pairing. Second, in these materials is high temperature the superconducting transition, the values of the upper critical field (magnetic field, that at this temperature causes the material of the superconducting to the normal state), and the critical current density "- says leading researcher Yuri dace. in samples synthesized at FIAN, the values of the upper critical field approaching 100 tesla, temperature go as high as 21 kelvin. For these parameters the new compounds can compete with the best foreign analogues in the class of materials based on iron and arsenic, and are promising candidates for practical use — especially when creating a magnet with superstrong fields.

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