Izyumov, Yuri Alexandrovich

Izyumov spent his whole life in the Urals. Born in Sverdlovsk in 1933, graduated from Ural State University. From 1959 until his death, he was an employee of the Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences (IPM) .

At school, he actively participated in the work of the geographical society Globus of the Sverdlovsk Palace of Pioneers . In 1951 he graduated from school number 1 with a gold medal , in the same year he entered the Faculty of Physics and Mathematics (later renamed the Faculty of Physics ) of Ural State University named after A. M. Gorky . From the first courses he was fond of modern problems of quantum mechanics , attended lectures for undergraduates. After graduation, he entered graduate school to S.V. Vonsovsky , in the laboratory (magnetic neutron diffraction) under whose guidance he subsequently remained to work.

Its leader wrote that “already in graduate school, Yu. A. Izyumov developed those features that are characteristic of all his subsequent scientific work. Among them, the main thing is the desire to solve mathematical problems strictly mathematically, using modern mathematical methods of quantum theory for this, primarily the method of temperature Green's functions. ”

After graduating from graduate school, Yuri Alexandrovich began working at the Institute of Physics and Mathematics, where in 1960 he defended his thesis “Some Issues of the Spin-Wave Theory of Ferromagnetism ” related to the study of elementary excitations of ferromagnets and especially ferromagnetic metals.

In 1965, he completed a six-month internship with Rudolf Peierls at Oxford University .

In 1967 he defended his doctoral dissertation.

Created at the Institute of Metal Physics a laboratory of solid state theory, which he headed for many years. He was the chairman of the scientific council of the Institute on the topic "Electronic properties of condensed matter."

Yu. A. Izyumov was the chairman of the Joint Scientific Council on Physical and Technical Sciences under the Presidium of the Ural Branch of the Russian Academy of Sciences, a member of the presidium of the Ural Branch of the Russian Academy of Sciences , a number of scientific councils, and editorial boards of domestic and international physical journals. He taught for a long time at the Ural State University , prepared 7 doctors of sciences.

He was buried in Yekaterinburg at the Shirokorechensky cemetery .

The main areas of scientific activity are neutron diffraction by magnetically ordered crystals , phase transitions , the quantum theory of magnetism , and superconductivity .

• developed the theory of scattering of slow neutrons in magnetically ordered crystals, obtained an exact solution to the problem of neutron diffraction by a soliton lattice
• introduced the theory of crystal symmetry using group theory (irreducible representations of spatial Fedorov groups instead of the used Shubnikov groups of black and white symmetry , or their generalization - color groups , which had less universality) in magnetic neutron diffraction ,
• predicted a number of effects in the scattering of polarized neutrons; He proposed the theory of exchange multiplets to describe magnetic structures and phase transitions between them.
• In the 1960s, in collaboration with M.V. Medvedev, he created the theory of magnetically ordered crystals with impurities , on the basis of which he predicted the quasilocal state in the magnon spectrum of a crystal with a weakly bound impurity and obtained an exact solution to the problem of two impurity atoms with antiferromagnetic bonds located in a ferromagnetic matrix.

He created the theory of magnetically ordered crystals with impurities. The exact solution of the problem of two antiferromagnetically coupled impurity atoms immersed in a ferromagnetic matrix made it possible to explain the anomalous properties of transition metal alloys with a mixed exchange interaction. He developed in detail the theory of the superconducting state and magnetic order in contacts and superlattices constructed of metallic ferromagnetic and superconducting layers. In the field of the theory of strongly correlated systems, he developed the method of the generating functional and applied to a comprehensive study of the quasiparticle spectrum and collective modes for the basic models of the quantum theory of magnetism . He put forward the idea of ​​exchange multiplets and developed an application of this idea to phase transitions in magnetic systems.

Izyumov made a great contribution to the development of the mathematical apparatus in the theory of magnetic systems. In the late 1960s, together with F.A. Kassan-Ogly and Yu. N. Skryabin, he developed an easy-to-use version of the diagram technique for spin operators, and later, with the participation of Yu. N. Skryabin and B.N. Letfulov for operators, introduced in the study of strongly correlated electronic systems (the so-called Hubbard X-operators). He developed a method of a generating functional for spin and strongly correlated systems, the idea of ​​which is to consider the system under study in the presence of external fields fluctuating in space and time. As a result, he formulated a “generalized approximation of chaotic phases”, which made it possible to solve the problem of fluctuations of the longitudinal component of the spin in an isotropic ferromagnet, and to construct a magnetic phase diagram for strongly correlated metal models.

The author of 202 scientific works, of which 15 monographs in various areas of solid state physics, including:

• 1966: “Magnetic neutron diffraction” (together with R. P. Ozerov)
• 2008: “Electronic structure of compounds with strong correlations” (together with V. I. Anisimov).
• 2009: “High-temperature superconductors based on FeAs compounds” (together with E. Z. Kurmaev)

6 of which are translated into English, including:

• "Neutronography of magnets"
• “Phase transitions and crystal symmetry" (together with V. N. Syromyatnikov)
• 1977: “Superconductivity of metals, their alloys and compounds” (S. V. Vonsovsky, Yu. A. Izyumov and E. Z. Kurmaev)
• “Statistical mechanics of magnetically ordered systems” (together with Yu. N. Skryabin)

The average citation rate is 9.5 citations per article, the Hirsch index is 31 ^[2] .

The merits of Yu. A. Izyumov were marked by many government awards, including the medal "For Valiant Labor" (1970), the Soviet Order of the Red Banner of Labor (1983), the medal " Veteran of Labor " (1986), and the Russian Order of Honor (2004).

He is a laureate of the USSR State Prize (1986) for his work on the creation of new methods for studying solids using neutron beams in stationary atomic reactors.

In 2007, “Yu. A. Izyumov was awarded the Gold Medal of the name of S. V. Vonsovsky for“ high scientific achievements, a great contribution to the development of theoretical physics in the Urals and the training of highly qualified personnel ”.

• Izyumov Yuri Alexandrovich on the website of USU
• Izyumov Yuri Alexandrovich - about science, about himself and about life
• Profile of Yuri Alexandrovich Izyumov on the official website of the RAS
• In memory of academician Yu.A. Izyumova // Science of the Urals. - 2010. - Issue. No. 17 (1022), August 2010 . - S. 2 .