Question: When was the  Soviet, Russian and American theoretical physicist died who describe the magnetic phase diagram of type-II superconductors of Onsager?
Sentence (from "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.
Relevant evidence: Yes