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2003 | 1 | 4 | 655-668
Tytuł artykułu

Positron annihilation study for cadmium (electronic structure and enhancement effect)

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The three dimensional electron density in momentum space ρ(p) and in wave vector space n(k) was reconstructed for cadmium (Cd). The measurements were performed using the two dimensional angular correlation of annihilation radiation (2D-ACAR) technique. Enhanced contributions in the spectra were observed around 5.5 mrad, discussed in terms of a Kahana-like enhancement effect. From another viewpoint, Fermi radii were analyzed in the (λM K), (ALM) and (AHK) planes, and they showed a maximum deviation of about 4% from the free electron Fermi radius. Moreover, comparisons to a radio-frequency size effect (RFSE) experiment and theoretical band structure calculations (using augmented plane wave (APW), linear combination of atomic orbital (LCAO) and linear muffin tin orbital (LMTO) methods) were examined. The results showed a qualitative agreement with both APW and LCAO calculations. However, a favorable agreement with the APW method was determined via Fermi surface dimensions. The differences of bands' occupation of n(k) between the current work and the APW method were argued in view of positron wave function in Cd.
Wydawca

Czasopismo
Rocznik
Tom
1
Numer
4
Strony
655-668
Opis fizyczny
Daty
wydano
2003-12-01
online
2003-12-01
Twórcy
autor
  • Department of Physics, Faculty of Science, Helwan University, 11795, Cairo, Egypt, aladin331@yahoo.com
Bibliografia
  • [1] S. Daniuk, T. Jarlborg, G. Kontrym-Sznajd, J. Majsnerowski and H. Stachowiak: “Fermi surface of Mg and Cd”, J. Phys. Condens. Matter, Vol. 1, (1989), pp. 8397. http://dx.doi.org/10.1088/0953-8984/1/44/011[Crossref]
  • [2] W.A. Harrison: “Band structure and Fermi surface of Zinc”, Phys. Rev., Vol. 126, (1962), pp. 497. http://dx.doi.org/10.1103/PhysRev.126.497[Crossref]
  • [3] R.W. Stark and L.M. Falicov: “Band structure and Fermi surface of Zinc and cadmium”, Phys. Rev. Letter, Vol. 19, (1967), pp. 795. http://dx.doi.org/10.1103/PhysRevLett.19.795[Crossref]
  • [4] G. Kontrym-Sznajd and J. Majsnerowski: “Electron-positron pair momentum densities in Mg and Cd”, Sol. Stat. Communicat, Vol. 70, (1989), pp. 593. http://dx.doi.org/10.1016/0038-1098(89)90356-6[Crossref]
  • [5] P. Shinha and S. Chatterjee: “Energy band structure of zinc and cadmium”, J. Phys., Vol. F7, (1977), pp. 105. http://dx.doi.org/10.1088/0305-4608/7/1/020[Crossref]
  • [6] D.A. Papaconstantopoulos: “Handbook of the band structure of elemental solids”, Plenum Press, New York, 1986.
  • [7] G. Kontrym-Sznajd and J. Majsnerowski: “Electron-positron Pair Momentum densities in Mg and Cd”, Solid State Communicat., Vol. 70, (1989), pp. 593. http://dx.doi.org/10.1016/0038-1098(89)90356-6[Crossref]
  • [8] G. Kontrym-Sznajd and A. Rubaszek: “Interpretation of positron-annihilation data with respect to the electron-positron enhancement factors. II. Applications”, Phys. Rev. B, Vol. 47, (1993), pp. 6960. http://dx.doi.org/10.1103/PhysRevB.47.6960[Crossref]
  • [9] G. Kontrym-Sznajd and A. Rubaszek: “Interpretation of positron-annihilation data with respect to the electron-positron enhancement factors. I. Theory”, Phys. Rev. B, Vol. 47, (1993), pp. 6950. http://dx.doi.org/10.1103/PhysRevB.47.6950[Crossref]
  • [10] G. Kontrym-Sznajd, H. Sormann: “Electronic structure seen by positrons in extended and reduced zone scheme”, Acta Physica Polonica A, Vol. 88, (1995), pp. 17.
  • [11] R. Suzuki and M. Osawa, S. Tanigawa, M. Matsumoto and N. Shiotani: “Positron Study of Electron Momentum Density and Fermi surface in Titanium and Zirconium”, J. Phys. Soc. Jpn, Vol. 58, (1989), pp. 3251. http://dx.doi.org/10.1143/JPSJ.58.3251[Crossref]
  • [12] A. S. Abdul Hamid and S. Tanigawa: “Study on the electron-positron momentum density and Fermi surface in Hf using 2D-ACAR experiment”, Phys. Stat. Sol. (b), Vol. 215, (1999), pp. 1033. http://dx.doi.org/10.1002/(SICI)1521-3951(199910)215:2<1033::AID-PSSB1033>3.0.CO;2-D[Crossref]
  • [13] G. Kontrym-Sznajd: “Three-Dimensional Image Reconstruction with Application in Positron Annihilation”, Phys. Stat. Sol. (a), Vol. 117, (1990), pp. 227.
  • [14] J. Arponnen and C. Pajanne: “Angular correlation of positron annihilation”, J. Phys., Vol. F9, (1979), pp. 2359. http://dx.doi.org/10.1088/0305-4608/9/12/009[Crossref]
  • [15] H. Nakashima, T. Kubota, H. Kondo, Y. Murakami, S. Tanigawa: “Study on Momentum Density of Electrons and Fermi surface in Aluminum by Positron Annihilation”, PPhys. Stat. Sol (b), Vol. 170, (1992), pp. 171.
  • [16] D.G. Lock, V.H.C. Crisp, R.N. West: “Positron annihilation and Fermi surface studies: a new approach”, J. Phys., Vol. F3, (1973), pp. 561. http://dx.doi.org/10.1088/0305-4608/3/3/014[Crossref]
  • [17] R.C. Jones, R.G. Goodrich, L.M. Falicov: “Fermi Surface of Cadmium: Radio-Frequency Size Effect”, Phys. Rev., Vol. 174, (1958), pp. 672. http://dx.doi.org/10.1103/PhysRev.174.672[Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_BF02475909
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