Positron-annihilation studies on the YBa2Cu4O8 superconductor

Sundar, C. S. ; Bharathi, A. ; Jean, Y. C. ; Hor, P. H. ; Meng, R. L. ; Xue, Y. Y. ; Huang, Z. J. ; Chu, C. W. (1990) Positron-annihilation studies on the YBa2Cu4O8 superconductor Physical Review B: Condensed Matter and Materials Physics, 41 (16). pp. 11685-11688. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v41/i16/p11685_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.41.11685


Positron-lifetime and Doppler-broadened annihilation-radiation line-shape parameter S in YBa2Cu4O8 are observed to decrease with temperature below Tc. The calculation of the positron-density distribution shows that the maximum of the positron density is in the region between the Cu-O double chains. The correlation between the temperature dependence of annihilation parameters and the positron-density distribution is discussed. The decrease in annihilation parameters below Tc is understood in terms of a local electron transfer from the CuO2 layers to the Cu-O chains in the superconducting state.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:53199
Deposited On:05 Aug 2011 10:32
Last Modified:05 Aug 2011 10:32

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