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Positron Lifetime Studies of Defect Structures in Bal-xKxBiO3

  • J.C. O'Brien (a1), R.H. Howell (a1), H.B. Radousky (a1), P.A. Sterne (a1), D.G. Hinks (a2), T.J. Folkerts (a3) and R.N. Shelton (a3)...

Abstract

Temperature-dependent positron lifetime experiments have been performed from room temperature to cryogenic temperatures on Ba1−xKxBiO3. for x=0.4 and 0.5. From the temperature dependence of the positron lifetime in the normal state, we observe a clear signature of competition between separate defect populations to trap the positron. Theoretical calculations of lifetimes of free or trapped positrons have been performed on Ba1−xKxBiO3, to help identify these defects. Lifetime measurements separated by long times have been performed and evidence of aging effects in the sample defect populations is seen in these materials.

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1. Petersen, K., in Positron Solid State Physics, edited by Brandt, W. and Dupasquier, A. (Elsevier North-Holland, New York) pp. 298–358.
2. Sterne, P.A., O'Brien, J.C., Howell, R.H., and Kaiser, J.H., this volume.
3 McCarty, K.F., Radousky, H.B., Hinks, D.G., Aheng, Y., Mitchell, A.W., Folkerts, T.J., and Shelton, R.N., Phys Rev B 40, 2662 (1989).
4. Veal, B.W., You, H., Paulikas, A.P., Shi, H., Fang, Y., and Downey, J.W., Phys Rev B 42, 4770 (1990).
5. Howell, R.H., Radousky, H.B., Wachs, A.L., Fluss, M.J., Turchi, P.E.A., Jean, Y.C., Sundar, C.S., Chu, C.W., Peng, J.L., Folkerts, T.J., Shelton, R.N., and Hinks, D.G., Physica C 162–164, 1377 (1989).

Positron Lifetime Studies of Defect Structures in Bal-xKxBiO3

  • J.C. O'Brien (a1), R.H. Howell (a1), H.B. Radousky (a1), P.A. Sterne (a1), D.G. Hinks (a2), T.J. Folkerts (a3) and R.N. Shelton (a3)...

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