Advertisement

Il Nuovo Cimento B (1971-1996)

, Volume 46, Issue 2, pp 337–362 | Cite as

Phonon modes in Pd-Pt and other substitutional alloys with large mass disorder

  • P. Bosi
  • F. Duprè
  • F. Menzinger
  • F. Sacchetti
  • M. C. Spinelli
Article

Summary

Firstly we report here the results of a neutron scattering experiment on the phonon dispersion relations and phonon lifetimes in the alloy Pd0.84-Pt0.16 and compare them with those of an existing coherentpotential approximation calculation. We find good agreement in the frequency and shape of the resonance and remaining discrepancies are discussed. Then the results of existing or new CPA calculations for several other alloys are compared with experimental data on resonant and localized modes observed by other authors in the alloys. For these other systems in most cases a satisfactory agreement is found in the frequency position and shape of the resonance or of the localized mode, when the alloy characteristics are suited for a straightforward application of mass defect CPA. The relevance of these tests for CPA is also discussed.

Фононные моды в Pd-Pt П других сплавах замещения

Резюме

В работе сообщаются результаты эксперимента по рассеянию нейтронов, касающиеся фононных дисперсионных соотношений и времен жизни фононов в сплаве Pd0.84-Pt0.16. Полученные результаты сравниваются с имеющимся вычислением в приближении когерентного потенциала. Получено хорощее согласие для частоты и формы резонанса. Обсуждаются расхождения. Затем результаты имеющихся или новых вычислений в приближении когерентного потенциала для некоторых других сплавов сравниваются с экспериментальными данными для резонансной и локлизованной мод, наблюденных другими авторами в сплавах. В большинстве случаев обнаружено удовлетворительное согласие для значения частоты и формы резонанса или локаизованной моды. Также обсуждается уместность зтих тестов для приближения когерентного нотенциала.

Riassunto

Si riferiscono qui i risultati di un esperimento di scattering di neutroni sulle curve di dispersione e le vite medie fononiche nella lega Pd0.84-Pt0.16, e le si confronta con quelle previste dall’approssimazione del potenziale coerente. Si trova un buon accordo nella frequenza e forma della risonanza e si discutono le residue discrepanze. Poi i risultati di nuovi of già esistenti calcoli CPA sono confrontati con i dati sperimentali per molte altre leghe sostituzionali, dove da altri sperimentatori sono state osservate risonanze o stati localizzati. Per questi altri sistemi si trova in molti casi un accordo soddisfacente per la posizione energetica e forma della risonanza o del modo localizzato, quando le caratteristiche della lega sono adatte per un’applicazione diretta del CPA per difetto di massa. Si discute infine la rilevanza di queste prove per il CPA.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. (1).
    R. J. Elliott, J. A. Krumhouse andP. L. Leath:Rev. Mod. Phys.,46, 465 (1974) and references therein.ADSCrossRefGoogle Scholar
  2. (2).
    F. Sacchetti:Nuovo Cimento,32 B, 285 (1976) and references therein.ADSCrossRefGoogle Scholar
  3. (3).
    F. Sacchetti andM. C. Spinelli:Phys. Stat. Sol.,72, 653 (1975).ADSCrossRefGoogle Scholar
  4. (4).
    D. W. Taylor:Phys. Rev.,156, 1017 (1967).ADSCrossRefGoogle Scholar
  5. (5).
    A. D. B. Woods andB. M. Powell:Phys. Rev. Lett.,15, 778 (1965);B. M. Powell, P. Martell andA. D. B. Woods:Phys. Rev.,171, 727 (1968).ADSCrossRefGoogle Scholar
  6. (6).
    S. C. Ng andB. N. Brockhouse:Solid State Comm.,5, 79 (1967).ADSCrossRefGoogle Scholar
  7. (7).
    E. D. Hallam andB. N. Brockhouse:Can. Journ. Phys.,47, 1117 (1969).ADSCrossRefGoogle Scholar
  8. (8).
    W. A. Kamitakahara: Ph. D. Thesis, McMaster University (1972), unpublished.Google Scholar
  9. (9).
    F. Menzinger, F. Sacchetti andM. C. Spinelli:Phys. Rev. B,12, 2253 (1975).ADSCrossRefGoogle Scholar
  10. (10).
    F. Sacchetti:J. Phys. F.,8, 743 (1978), in press.ADSCrossRefGoogle Scholar
  11. (11).
    H. Bjerrum-Möller andA. R. Mackintosh:Phys. Rev. Lett.,15, 623 (1965).ADSCrossRefGoogle Scholar
  12. (12).
    A. R. Mackintosh andH. Bjerrum-Möller: inLocalized Excitations in Solids, edited byR. F. Wallis (New York, N. Y., 1968), p. 721.Google Scholar
  13. (13).
    R. M. Cunningham, L. D. Muhlenstein, W. M. Shaw andC. W. Thompson:Phys. Rev. B,2, 4864 (1970).ADSCrossRefGoogle Scholar
  14. (14).
    E. C. Svensson, B. N. Brockhouse andJ. M. Rowe:Solid State Comm.,3, 245 (1965).ADSCrossRefGoogle Scholar
  15. (15).
    E. C. Svensson andB. N. Brockhouse:Phys. Rev. Lett.,18, 858 (1967).ADSCrossRefGoogle Scholar
  16. (16).
    E. C. Svensson andW. A. Kamitakahara:Can. Journ. Phys.,49, 2291 (1971).ADSCrossRefGoogle Scholar
  17. (17).
    R. M. Nicklow, P. R. Vijayghavan, H. G. Smith andM. K. Wilkinson:Phys. Rev. Lett.,20, 1245 (1968).ADSCrossRefGoogle Scholar
  18. (18).
    R. M. Nicklow, P. R. Vijayghavan, H. G. Smith, G. Dolling andM. K. Wilkinson:I.A.E.A. Inelastic Scattering of Neutrons Oonference (Vienna, 1968), p. 47.Google Scholar
  19. (19).
    N. Kunitomi, Y. Tsunoda andY. Hirai:Solid State Comm.,13, 495 (1973).ADSCrossRefGoogle Scholar
  20. (20).
    W. A. Kamitakahara andB. N. Brockhouse:Phys. Rev. B,10, 1200 (1974).ADSCrossRefGoogle Scholar
  21. (21).
    J. Als-Nielsen:I.A.E.A. Inelastic Scattering of Neutrons Conference (Vienna, (1968), p. 35.Google Scholar
  22. (22).
    N. Wakabayashi, R. M. Nicklow andH. G. Smith:Phys. Rev. B,4, 2558 (1971).ADSCrossRefGoogle Scholar
  23. (23).
    M. Mostoller, T. Kaplan, N. Wakabayashi andR. M. Nicklow:Phys. Rev. B,10, 3144 (1974).ADSCrossRefGoogle Scholar
  24. (24).
    W. A. Kamitakahara andJ. R. D. Copley: ORNL 4952 (1973).Google Scholar
  25. (25).
    H. J. Smith, N. Wakabayashi andM. Mostoller: inSuperconductivity in d- and f-band Metals, edited byD. H. Douglass (New York, N. Y., 1976).Google Scholar
  26. (26).
    T. Kaplan andM. Mostoller:Phys. Rev. B,9, 353 (1974).ADSCrossRefGoogle Scholar
  27. (27).
    N. Wakabayashi:Phys. Rev. B,8, 6015 (1973).ADSCrossRefGoogle Scholar
  28. (28).
    G. Grünewald andK. Sharnberg:International Conference on Lattice Dynamics, Paris, September 1977.Google Scholar
  29. (29).
    M. Mostoller andT. Kaplan:Phys. Rev. B,16, 2350 (1977).ADSCrossRefGoogle Scholar
  30. (30).
    P. Lloyd andJ. Oglesby:J. Phys. C,9, 4383 (1976).ADSCrossRefGoogle Scholar
  31. (31).
    A. P. Müller andB. N. Brockhouse:Can. Journ. Phys.,49, 704 (1971).ADSCrossRefGoogle Scholar
  32. (32).
    M. J. Cooper andR. Nathans:Acta Cryst.,23, 357 (1967).CrossRefGoogle Scholar
  33. (33).
    D. H. Dutton, B. N. Brockhouse andA. P. Müller:Can. Journ. Phys.,50, 2915 (1972).ADSCrossRefGoogle Scholar
  34. (34).
    W. Kohn:Phys. Rev. Lett.,2, 393 (1959).ADSCrossRefGoogle Scholar
  35. (35).
    R. J. Birgeneau, L. Cordes, G. Dolling andA. D. B. Woods:Phys. Rev.,136, A 1359 (1964).ADSCrossRefGoogle Scholar
  36. (36).
    S. M. Shapiro andS. C. Moss: Report Brookhaven BNL 21940 (1976).Google Scholar
  37. (37).
    G. Grünewald:Journ. Metal Phys.,6, 999 (1976).ADSCrossRefGoogle Scholar
  38. (38).
    T. Kaplan andM. Mostoller:Phys. Rev. B,9, 1783 (1974).ADSCrossRefGoogle Scholar
  39. (39).
    B. Velický, S. Kirkpatrik andH. Ehrenreich:Phys. Rev.,175, 747 (1968);S. Kirkpatrick, B. Velický andH. Ehrenreich:Phys. Rev. B,1, 3250 (1970).ADSCrossRefGoogle Scholar
  40. (40).
    R. M. Nicklow, G. Gilat, H. G. Smith, L. J. Raubenheimer andM. K. Wilkinson:Phys. Rev.,164, 922 (1967).ADSCrossRefGoogle Scholar
  41. (41).
    G. Gilat andR. M. Nicklow:Phys. Rev.,143, 487 (1966).ADSCrossRefGoogle Scholar
  42. (42).
    R. J. Elliott andA. A. Maradudin:I.A.E.A. Inelastic Scattering of Neutrons Conference (Vienna, 1965), p. 231.Google Scholar
  43. (43).
    R. Bruno andD. W. Taylor:Can. Journ. Phys.,49, 2496 (1971).ADSCrossRefGoogle Scholar
  44. (44).
    K. M. Kesharwani andB. K. Agrawal:Phys. Rev.,7, 5153 (1973).ADSCrossRefGoogle Scholar
  45. (45).
    J. W. Lynn, N. G. Smith andR. M. Nicklow:Phys. Rev. B,8, 3493 (1973).ADSCrossRefGoogle Scholar
  46. (46).
    W. M. Shaw andL. D. Muhlenstein:Phys. Rev. B 4, 969 (1971).ADSCrossRefGoogle Scholar
  47. (47).
    G. Gilat:Phys. Rev.,157, 540 (1967).ADSCrossRefGoogle Scholar
  48. (48).
    K. M. Kesharwani andB. K. Agrawal:Phys. Rev. B,6, 2178 (1972).ADSCrossRefGoogle Scholar
  49. (49).
    A. Zinken, U. Buchenau, H. J. Fenzl andH. R. Schober: inInternational Conference on Lattice Dynamics, Paris, September 1977.Google Scholar
  50. (50).
    W. A. Kamitakahara andB. N. Brockhouse:Phys. Lett.,29 A, 639 (1969).ADSCrossRefGoogle Scholar
  51. (52).
    M. Hansen:Constitution of Binary Alloys (New York, N. Y., 1958), p. 570.Google Scholar
  52. (53).
    J. D. Axe, D. T. Keating andS. C. Moss:Phys. Rev.,35, 530 (1975).ADSGoogle Scholar
  53. (54).
    F. Sacchetti, P. Bosi, F. Duprè, G. Frollani, F. Menzinger andM. C. Spinelli:Phys. Stat. Sol.,85 B, 657 (1978).Google Scholar
  54. (55).
    B. G. Nickel andW. H. Butler:Phys. Rev. Lett.,30, 373 (1973).ADSCrossRefGoogle Scholar

Copyright information

© Società Italiana di Fisica 1978

Authors and Affiliations

  • P. Bosi
    • 1
    • 2
  • F. Duprè
    • 1
    • 2
  • F. Menzinger
    • 1
    • 2
  • F. Sacchetti
    • 1
    • 2
  • M. C. Spinelli
    • 1
    • 2
  1. 1.Gruppo Nazionale di Struttura della Materia del C.N.R.RomaItalia
  2. 2.Istituto di Fisica dell’UniversitàRomaItalia

Personalised recommendations