Pyotr Leonidovich Kapitsa or Peter Kapitza (Russian: Пётр Леони́дович Капи́ца, Romanian: Petre Capiţa (8 July [O.S. 26 June] 1894[2] – 8 April 1984) was a leading Soviet physicist and Nobel laureate,[3][4] best known for his work in low-temperature physics.
https://en.wikipedia.org/wiki/Pyotr_Kapitsa