New Aspects of Photoinduced Paramagnetic States in Chalcogenide Glasses

  • S. G. Bishop
  • U. Strom
  • J. A. FreitasJr.
Part of the Institute for Amorphous Studies Series book series (IASS)


Professor Fritzsche and coworkers have made many important contributions to the study of localized states in amorphous solids. In particular, the seminal work of Cohen, Fritzsche, and Ovshinsky (CF0)1 set the stage for a decade of intense experimental and theoretical investigations of localization and the nature of localized states. Much of the early work was concerned with the apparently contradictory information obtained with different experimental probes. Specifically, for the case of chalcogenide glasses, the results of transport and other measurements (as reviewed comprehensively by Professor Fritzsche2) were interpreted as evidence for the existence of localized states in the gap of these amorphous solids. The pinning of the Fermi level near mid-gap was cited as incontravertible evidence for a high density of localized states, and estimates of the density of states at the Fermi energy were on the order of 1018cm–3.However, early electron spin resonance (ESR) experiments3, specifically the definitive experiments carried out in Professor Fritzsches laboratory, demonstrated that under equilibrium conditions the density of unpaired spins in high purity chalcogenide glasses was less than 1014cm–3 The ESR experiments were consistent with the failure to observe Curie paramagnetism at low temperature4,5, which provided further evidence for the diamagnetism of high purity chalcogenide glasses.


Electron Spin Resonance Electron Spin Resonance Signal Chalcogenide Glass Electron Spin Resonance Line Electron Spin Resonance Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    M. H. Cohen, H. Fritzsche, and S. R. Ovshinsky, Phys. Rev. Lett., 22: 1065 (1970).ADSCrossRefGoogle Scholar
  2. 2.
    H. Fritzsche, in: “Electronic and Structural Properties of Amorphous Semiconductors, Proceedings of 13th Session of the Scottish Universities “Summer School”, P. G. LeComber and S. Mort, eds., Academic Press, New York (1973).Google Scholar
  3. 3.
    S. C. Agarwal, Phys. Rev. B7: 685 (1973).ADSGoogle Scholar
  4. 4.
    F. J. DiSalvo, A. Menth, J. V. Waszcak, and J. Tauc, Phys. Rev. B6: 4574 (1972).ADSGoogle Scholar
  5. 5.
    J. Tauc, F. J, DiSalvo, G. E. Peterson, and D. L. Wood, in: “Amorphous Magnetism”, H. O. Hooper and A, M. DeGraaf, eds., Plenum, New York (1973), P. 119.CrossRefGoogle Scholar
  6. 6.
    P. W. Anderson, Phys. Rev. Lett., 34: 953 (1975).ADSCrossRefGoogle Scholar
  7. 7.
    S. G. Bishop, U. Strom, and P. C. Taylor, Phys. Rev. Lett. 34: 1346 (1975); Phys. Rev. Lett. 36: 543 (1976); Phys. Rev. B15: 2278 (1977).ADSCrossRefGoogle Scholar
  8. 8.
    P. J. Gaczi and H. Fritzsche, Solid St. Commun. 38: 23 (1981).ADSCrossRefGoogle Scholar
  9. 9.
    P. J. Gaczi, Phil. Mag. B45: 241 (1982).Google Scholar
  10. 10.
    C. Benoit a la Guillaume, F. Mollot, and J. Cernogora, in: “Proc. 7tn Intl. Conf. on Amorphous and Liq. Semicond”, W. E. Spear, ed., Univ. of Edinburgh (1977), P. 612.Google Scholar
  11. 11.
    D. K. Biegelsen and R. A. Street, Phys. Rev. Lett. 44: 803 (1980).ADSCrossRefGoogle Scholar
  12. 12.
    S. G. Bishop, U. Strom, and P. C. Taylor, in: “Proc. 7th Int. Conf. on Amorphous and Liq. Semicond,”, W. E. Spear, ed., Univ. of Edinburgh (1977), P. 595.Google Scholar
  13. 13.
    D. Monroe and M. A. Kastner, in: “Physics of Disordered Materials”, D. Adler, H. Fritzsche, and S. R. Ovshinsky, eds., Plenum Press, New York (1985), p. 553.Google Scholar
  14. 14.
    J. H. Stathis and M. A. Kastner, Phys. Rev. B29: 7079 (1984).ADSGoogle Scholar
  15. 15.
    S. G. Bishop, J. A. Freitas, Jr., and U. Strom, in: “Optical Effects in Amorphous Semiconductors”, P. C. Taylor and S. G. Bishop, eds., AIP Conf. Proc. No. 120 (1984), p. 86.Google Scholar
  16. 16.
    J. A. Freitas, Jr., U. Strom and S. G. Bishop, in: Physics of Disordered Materials”, D. Adler, H. Fritzsche, and S. R. Ovshinsky, eds., Plenum Press, New York (1985), P. 685.Google Scholar
  17. 17.
    R. A. Street and N. F. Mott, Phys. Rev. Lett. 35: 1293 (1975).ADSCrossRefGoogle Scholar
  18. 18.
    S. G. Bishop and P. C. Taylor, Phil. Mag. B40: 483 (1979).Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • S. G. Bishop
    • 1
  • U. Strom
    • 1
  • J. A. FreitasJr.
    • 1
    • 2
  1. 1.Naval Research LaboratoryUSA
  2. 2.Sachs/Freeman Assoc. Inc.BowieUSA

Personalised recommendations