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For single-phase Bi-2212, Doppler broadened positron annihilation radiation line shape (DBPARL) parameter S has been measured from 15 to 300 K. S represents the fraction of low momentum electrons involved in the annihilation process. It shows a broad dip in S over 58 to 90 K in contrast to the 90-110 K complex dip in (Bi, Pb)-2223. The shift of the dip to lower temperature for the lower-T c...
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