When was the  Soviet, Russian and American theoretical physicist died who describe the magnetic phase diagram of type-II superconductors of Onsager?
Alexei Alexeyevich Abrikosov Alexei Alexeyevich Abrikosov (Russian: Алексе́й Алексе́евич Абрико́сов ; 25 June 1928 – 29 March 2017) was a Soviet, Russian and American theoretical physicist whose main contributions are in the field of condensed matter physics. He was awarded the Nobel Prize in Physics in 2003.
Alexander Stepanovich Popov Alexander Stepanovich Popov (sometimes spelled Popoff; Russian: Алекса́ндр Степа́нович Попо́в ; March 16 [O.S. March 4] 1859 – January 13 [O.S. December 31, 1905] 1906 ) was a Russian physicist who is acclaimed in his homeland and some eastern European countries as the inventor of radio.