George Sawatzky

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George Sawatzky
Alma mater
OccupationUniversity teacher Edit this on Wikidata
Awards
Scientific career
ThesisSome properties of ferrimagnetic spinels and their determination with the Mössbauer effect (1969)
Websitephas.ubc.ca/users/george-sawatzky

George Albert Sawatzky

solid state physics and strongly correlated electron systems.[1] He has co-developed the Cini-Sawatzky theory of the Auger effect[2][3] and the ZSA (Zaanen-Sawatzky-Allen) classification of bandgaps in solids.[4]

Education and career

George A. Sawatzky earned in 1965 his B.S. in physics with Honours from the

Max Planck Institute.[7] He has been a visiting professor at the University of Osaka and the University of Paris.[1]
He has been the thesis advisor of over 40 doctoral students, at least 14 of whom have found employment as university professors.

Research

Since 1966 Sawatzky has published in scientific journals more than 380 articles. His papers have been cited more than 28,000 times according to ISI Thomson. He has published 77 papers with more than 100 citations and his so-called H index (Hirsch index is 87). According to CIFAR, his research "focuses on: electronic structure of nanostructured strongly correlated materials, such as magnetic materials, high temperature superconductors, and materials for electronics applications; the development and use of various synchrotron-based spectroscopic methods to study such systems; as well as theoretical methods to describe the relationship between the physical properties and the chemical composition, structure and morphology."[6]

Sawatzky has made major contribution to the understanding of transition metal oxides (such as gamma and alpha Fe2O3 and Fe3O4) and more generally correlated electron systems and also to the development of spectroscopic techniques suited to study the electronic structure of these systems. He generated some of the earliest ideas about effects such as transferred and, especially, supertransfered hyperfine fields and developed the theory to describe these in terms of the covalency of the Fe–O bonds. He pioneered the cluster approach now used in understanding the Fe-O-Fe bond angle, the superexchange interaction, and the supertransferred hyperfine fields, as well as the electronic structure of strongly correlated systems like the high temperature superconductors and colossal magneto resistance materials.

In the early 1970s Sawatzky and his co-workers used transport measurements and various resonant techniques like

ESR and NMR
to study spin echo NMR. The knowledge obtained concerning spin echo NMR led to the discovery of the so-called sand memory, which is a memory based on a powder of crystalline SiO2 in which the address of information is the frequency of an electromagnetic pulse and the content of such an address is observable in an echo at a time separation equal to that written perhaps a long time ago at the same frequency. The theory describing this effect was also developed by Sawatzky in collaboration with the solid state theorist Gerrit Vertogen.

In the 1980s Sawatzky showed how photoelectron and Bremsstrahlung isochromat spectroscopy could be used to determine the Hubbard U in magnetic impurity systems and rare earths. His group was the first to directly observe the exchange splitting of the Mn3d impurity states in the Kondo-like systems containing Mn impurities. His group also showed that the band gap in NiO was of a charge transfer type and not a Mott Hubbard type. Together with Jan Zaanen and James W. Allen, Sawatzky developed the ZSA model (which became widely used) for describing the basics of the electronic structure of 3d transition metal oxides.

In the mid 1980s Sawatzky was introduced to X-ray absorption spectroscopy and the use of synchrotron radiation by John Fuggle. Sawatzky and his group started a long and very productive study of X-ray spectroscopies which form the basis for widely used spectroscopies at present. Over the past 3 decades he has led important research in theories and experiments related to strongly correlated materials.

Honours and awards

Editorial Boards

  • 1992–1997 Editor of Journal of Physics and Chemistry of Solids
  • 1994–2001 Journal of Electron Spectroscopy and Related Phenomena (Advisory Editorial Board)
  • 2006–2010 Associate editor Europhysics Letters

References

  1. ^ a b NWO. "Prof. dr. G.A. (George) Sawatzky" (in Dutch).
  2. arXiv:cond-mat/0011300
    .
  3. ISBN 0750302569
    .
  4. ISBN 9781420008425
    .
  5. ^ "George Sawatzky". University of British Columbia.
  6. ^ a b CIFAR. "George A. Sawatzky".
  7. ^ "Max Planck Institute". Max Planck Institute.
  8. ^ "George Sawatzky". Royal Netherlands Academy of Arts and Sciences. Archived from the original on 8 August 2020.
  9. ^ Rijksuniversiteit Groningen. "Spinoza Prizes".
  10. ^ "NWO Spinoza Prize 1996". Netherlands Organisation for Scientific Research. 11 September 2014. Archived from the original on 2 November 2020. Retrieved 30 January 2016.

External links

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