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.
Aleksandr Chudakov Aleksandr Evgenievich Chudakov (16 June 1921 – 25 January 2001, Moscow) was a Soviet Russian physicist in the field of cosmic-ray physics, known for "Chudakov Effect", the effect of decreasing ionization losses for narrow electron-positron pairs and for experimentally confirming existence of the transition radiation.