The 65th anniversary of Professor Ihor Stasyuk
On 23 September 2003, Professor Ihor Stasyuk, Research Deputy Director and Head of the Quantum Statistics Department of the Institute for Condensed Matter Physics will celebrate his 65th birthday. Professor Ihor Stasyuk is a prominent Ukrainian scientist and high school teacher, Corresponding Me...
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| Datum: | 2003 |
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| Format: | Artikel |
| Sprache: | English |
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Інститут фізики конденсованих систем НАН України
2003
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| Schriftenreihe: | Condensed Matter Physics |
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| Zitieren: | The 65th anniversary of Professor Ihor Stasyuk // Condensed Matter Physics. — 2003. — Т. 6, № 3(35). — С. 563-565. — англ. |
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nasplib_isofts_kiev_ua-123456789-1207452025-06-03T16:30:10Z The 65th anniversary of Professor Ihor Stasyuk On 23 September 2003, Professor Ihor Stasyuk, Research Deputy Director and Head of the Quantum Statistics Department of the Institute for Condensed Matter Physics will celebrate his 65th birthday. Professor Ihor Stasyuk is a prominent Ukrainian scientist and high school teacher, Corresponding Member of the National Academy of Sciences of Ukraine, Doctor of Science in Physics and Mathematics. 2003 Article The 65th anniversary of Professor Ihor Stasyuk // Condensed Matter Physics. — 2003. — Т. 6, № 3(35). — С. 563-565. — англ. 1607-324X https://nasplib.isofts.kiev.ua/handle/123456789/120745 en Condensed Matter Physics application/pdf Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| language |
English |
| description |
On 23 September 2003, Professor Ihor Stasyuk, Research Deputy Director and
Head of the Quantum Statistics Department of the Institute for Condensed Matter
Physics will celebrate his 65th birthday.
Professor Ihor Stasyuk is a prominent Ukrainian scientist and high school teacher,
Corresponding Member of the National Academy of Sciences of Ukraine, Doctor of
Science in Physics and Mathematics. |
| format |
Article |
| title |
The 65th anniversary of Professor Ihor Stasyuk |
| spellingShingle |
The 65th anniversary of Professor Ihor Stasyuk Condensed Matter Physics |
| title_short |
The 65th anniversary of Professor Ihor Stasyuk |
| title_full |
The 65th anniversary of Professor Ihor Stasyuk |
| title_fullStr |
The 65th anniversary of Professor Ihor Stasyuk |
| title_full_unstemmed |
The 65th anniversary of Professor Ihor Stasyuk |
| title_sort |
65th anniversary of professor ihor stasyuk |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2003 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/120745 |
| citation_txt |
The 65th anniversary of Professor Ihor Stasyuk // Condensed Matter Physics. — 2003. — Т. 6, № 3(35). — С. 563-565. — англ. |
| series |
Condensed Matter Physics |
| first_indexed |
2025-11-28T17:22:11Z |
| last_indexed |
2025-11-28T17:22:11Z |
| _version_ |
1850055635236814848 |
| fulltext |
The 65th anniversary of Professor Ihor Stasyuk
On 23 September 2003, Professor Ihor Stasyuk, Research Deputy Director and
Head of the Quantum Statistics Department of the Institute for Condensed Matter
Physics will celebrate his 65th birthday.
Professor Ihor Stasyuk is a prominent Ukrainian scientist and high school teacher,
Corresponding Member of the National Academy of Sciences of Ukraine, Doctor of
Science in Physics and Mathematics.
Ihor Stasyuk was born on the 23rd of September 1938, in Berezhany Ternopil’
region. He finished school in 1954 in Stryj. The same year he entered Lviv State
University (Department of Physics) and graduated from it in 1959 with honours.
The studies were continued during the postgraduate course (1959–1962) guided by
the well known theorist, one of the founders of Lviv scientific school, Professor Abba
Glauberman. The result of his postgraduate study was his Cand. Sci. (Ph.D.) thesis
“The Method of Site Elementary Excitations in the Theory of Nonmetallic Crystals”
(1963). In these early works Ihor Stasyuk developed mathematical methods of site
operators for the description of multi-level systems. It is one of the forms of formalism
of Hubbard operators developed later on.
563
I.Stasyuk accomplished a series of original research papers devoted to the correla-
tion effects in crystals with narrow electron energy bands (together with L.Didukh).
The appearance of the states with magnetic ordering in such systems was investi-
gated. The proposed ideas and methods were further developed in the studies of
strain effects in semiconducting and semimetal crystals. In particular, there was es-
tablished the presence of self-consistent connection between filling of the electron
states in conduction band and crystal deformation. A number of characteristics of
phase transitions with the valence change were described. The effect of the exter-
nal mechanical stress on the electron spectrum of narrow gap semiconductors was
described as well.
Significant scientific achievements by Professor I.Stasyuk concern the theory of
ferroelectric phenomena in dielectric crystals. Peculiarities of dynamic characteris-
tics of KDP-type crystals were originally described based on the quasispin-phonon
model. The role was determined of short-range proton correlations in crystals with
hydrogen bonds as well as their contribution to the thermodynamics of these sys-
tems (together with R.Levitskii). Recently Professor I.Stasyuk studied the external
stress effect on the behaviour of hydrogen bonded ferroelectrics.
The crystals with structural phase transition of Jahn-Teller type were also his ob-
jects of investigation. The methods proposed by Professor I.Stasyuk made it possible
to describe various crystals with complex structure of electron spectra of Jahn-Teller
ions. Isothermal and isolated dipole and quadrupole susceptibility, elastic constants,
specific heat of such objects were also investigated.
Professor I.Stasyuk is widely recognized for developing the microscopic theory
of a number of induced optical effects in dielectric crystals (electro- and piezoop-
tic effects, electro- and piezogyration, magnetooptic effect, etc.). The microscopic
mechanism of these effects was established. In 1985 the developed theory formed
the basis of his Doctoral (Habilitation) thesis “Theory of the Effects Induced by
External Fields in Crystals with Structural Phase Transitions”.
Among the main scientific achievements by Professor I.Stasyuk there are the
results of investigations of the systems with local lattice anharmonicity, strong elec-
tron correlations and the problem of high-Tc-superconductivity (HTSC). The role of
kinematic mechanisms in superconductivity in the Hubbard model was studied to-
gether with the scientists of Joint Institute for Nuclear Research (Dubna). Professor
I.Stasyuk developed the original scheme of generalized random phase approximation
for the calculation of the correlation functions using a diagrammatic method when
dielectric susceptibility is studied (together with A.Shvajka). The possibility of the
appearance of instability with respect to the fluctuations of polarization or density
of electron charge in HTSC crystals was shown. As a result, the phases with different
types of ordering appear, such as ferroelectric, charge ordering, phase-separations.
In the recent years, an approximate analytical scheme of the dynamic mean-field
theory, that is used for electron systems with Hubbard correlations and is exact in
the limit of the infinite dimensionality of a space, was developed by I.Stasyuk. The
effective single-site problem arising within the framework of this method has been
formulated in terms of the auxiliary Fermi-field.
564
Professor I.Stasyuk proposed a series of models of a proton subsystem of various
types of crystals with hydrogen bonds. Based on these models the phase transi-
tions, thermodynamic and dynamic properties of a such systems were successfully
investigated.
Professor I.Stasyuk is a prominent teacher as well. Sixteen researchers under his
supervision became Candidates of Sciences; two of them are now Doctors of Sciences.
For the last forty years Professor I.Stasyuk has had lectures of different classical and
modern courses on theoretical physics at the Ivan Franko Lviv National University.
Professor I.Stasyuk is associate editor of the “Condensed Matter Physics”, mem-
ber of the editorial board of the “Journal of Physical Studies”, and Physical Col-
lection volumes of Shevchenko Scientific Society. Ihor Stasyuk has been head and a
member of organizing and programme committees of many conferences on physics.
Editorial Board of the “Condensed Matter Physics” and colleagues from the
Institute for Condensed Matter Physics congratulate Professor Ihor Stasyuk on his
65th birthday and wish him to stay in good health and many more years of fruitful
scientific work.
565
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