Local charge-density change and superconductivity: a positron study

Jean, Y. C. ; Sundar, C. S. ; Bharathi, A. ; Kyle, J. ; Nakanishi, H. ; Tseng, P. K. ; Hor, P. H. ; Meng, R. L. ; Huang, Z. J. ; Chu, C. W. ; Wang , Z. Z. (1990) Local charge-density change and superconductivity: a positron study Physical Review Letters, 64 (13). pp. 1593-1596. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v64/i13/p1593_1

Related URL: http://dx.doi.org/10.1103/PhysRevLett.64.1593


The temperature dependence between 10 and 300 K of the positron lifetime was measured in the high-temperature superconductors YBA2(Cu1-xMx)3O6+δ, where M=Zn and Ga with x=0.0 to 0.07 and δ>0.8. In the undoped and Ga-doped samples, the positron lifetime in the Bloch state, τb, was observed to decrease below Tc. In the Zn-doped samples, a dramatic x-dependent temperature variation of τbwas observed: from a decrease of Tb below Tc for x=0.01 to an increase of τb for x>0.02. These new experimental results are interpreted in terms of a change in the local charge density of high-Tc oxides associated with the superconducting transition.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:53184
Deposited On:05 Aug 2011 07:46
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