Studies of superconducting alloys with structural changes induced by a mega-gravity

Nishio, Taichiro*; Hirai, Yuya*; Shimizu, Hideki*; Ono, Masao  ; Okayasu, Satoru  ; Ogata, Yudai*; Mashimo, Tsutomu*

One of the ultimate goals in superconducting studies is the synthesis of a material which becomes superconducting at room temperature. However, the goal has not been in sight yet for more than 25 years after discovering a series of high-Tc copper-oxide superconductors. We think that behaviors of superconductors under extreme conditions give us a hint to obtain a higher transition temperature Tc. It is well known the Tc becomes higher under high pressure for most superconductors. The structual strain plays an important role for Tc. We forcus our attention to other structual strain caused by a mega-gravity. Under the mega-gravity, the heavier atoms move to the gravitational direction, and the lighter to the opposite. As a result, a different kind of strain can be applied. We show the changes of superconducting properties due to the maga-gravity for some superconductors.