Auger Transition from Orbitally Degenerate Systems: Effects of Screening and Multielectron Excitations

D. D. Sarma; Priya Mahadevan

doi:10.1103/PhysRevLett.81.1658

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Auger Transition from Orbitally Degenerate Systems: Effects of Screening and Multielectron Excitations

D. D. Sarma^* and Priya Mahadevan^†

Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

^*Also at the Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore. Email address: sarma@sscu.iisc.ernet.in
^†Also at Department of Physics, IISc, Bangalore.

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Phys. Rev. Lett. 81, 1658 – Published 24 August, 1998

DOI: https://doi.org/10.1103/PhysRevLett.81.1658

Abstract

We calculate Auger spectra given by the two-hole Green's function from orbitally degenerate Hubbard-like models as a function of correlation strength and band filling. The resulting spectra are qualitatively different from those obtained from fully filled singly degenerate models due to the presence of screening dynamics and multielectron excitations. Application to a real system shows remarkable agreement with experimental results leading to reinterpretation of spectral features.

References (12)

P. Auger, J. Phys. Radium 6, 205 (1925).
D. D. Sarma et al., Phys. Rev. Lett. 63, 656 (1989); A. Kivimaäki et al., 71, 4307 (1993); Z. F. Liu et al., 72, 621 (1994); W. Drube, R. Treusch, and G. Materlik, 74, 42 (1995); S. Aksela, E. Kukk, H. Aksela, and S. Svensson, 74, 2917 (1995); E. Kukk et al., 76, 3100 (1996).
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Peter A. Bennett et al., Phys. Rev. B 27, 2194 (1983); D. K. G. de Boer, C. Haas, and G. A. Sawatzky, J. Phys. F 14, 2769 (1984); R. W. Lof et al., Phys. Rev. Lett. 68, 3924 (1992); K. Maiti et al., Phys. Rev. B 57, 1572 (1998).
J. C. Slater and G. F. Koster, Phys. Rev. 94, 1498 (1954).
D. D. Sarma and A. Taraphder, Phys. Rev. B 39, 11 570 (1989).
E. R. Gagliano and C. A. Balseiro, Phys. Rev. Lett. 59, 2999 (1987); E. Dagotto, Rev. Mod. Phys. 66, 763 (1994).
M. Abbate et al., Phys. Rev. B 49, 7210 (1994); T. Saitoh et al., 56, 1290 (1997).
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D. D. Sarma et al., Phys. Rev. Lett. 75, 1126 (1995).

[c1] P. Auger, J. Phys. Radium 6, 205 (1925).

[c2] D. D. Sarma et al., Phys. Rev. Lett. 63, 656 (1989); A. Kivimaäki et al., 71, 4307 (1993); Z. F. Liu et al., 72, 621 (1994); W. Drube, R. Treusch, and G. Materlik, 74, 42 (1995); S. Aksela, E. Kukk, H. Aksela, and S. Svensson, 74, 2917 (1995); E. Kukk et al., 76, 3100 (1996).

[c3] S. P. Kowalczyk et al., Phys. Rev. B 8, 2387 (1973); E. D. Roberts, P. Weightman, and C. E. Johnson, J. Phys. C 8, 2336 (1975).

[c4] M. Cini, Solid State Commun. 24, 681 (1977); Phys. Rev. B 17, 2788 (1978).

[c5] G. A. Sawatzky, Phys. Rev. Lett. 39, 504 (1977).

[c6] Peter A. Bennett et al., Phys. Rev. B 27, 2194 (1983); D. K. G. de Boer, C. Haas, and G. A. Sawatzky, J. Phys. F 14, 2769 (1984); R. W. Lof et al., Phys. Rev. Lett. 68, 3924 (1992); K. Maiti et al., Phys. Rev. B 57, 1572 (1998).

[c7] J. C. Slater and G. F. Koster, Phys. Rev. 94, 1498 (1954).

[c8] D. D. Sarma and A. Taraphder, Phys. Rev. B 39, 11 570 (1989).

[c9] E. R. Gagliano and C. A. Balseiro, Phys. Rev. Lett. 59, 2999 (1987); E. Dagotto, Rev. Mod. Phys. 66, 763 (1994).

[c10] M. Abbate et al., Phys. Rev. B 49, 7210 (1994); T. Saitoh et al., 56, 1290 (1997).

[c11] A. Chainani, M. Mathew, and D. D. Sarma, Phys. Rev. B 46, 9976 (1992).

[c12] D. D. Sarma et al., Phys. Rev. Lett. 75, 1126 (1995).

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Auger Transition from Orbitally Degenerate Systems: Effects of Screening and Multielectron Excitations

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