Local charge-density change and superconductivity: A positron study

Y. C. Jean, C. S. Sundar, A. Bharathi, J. Kyle, H. Nakanishi, P. K. Tseng, P. H. Hor, R. L. Meng, Z. J. Huang, C. W. Chu, Z. Z. Wang, P. E.A. Turchi, R. H. Howell, A. L. Wachs, M. J. Fluss

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The temperature dependence between 10 and 300 K of the positron lifetime was measured in the high-temperature superconductors YBA2(Cu1-xMx)3O6+where M=Zn and Ga with x=0.0 to 0.07 and >0.8. In the undoped and Ga-doped samples, the positron lifetime in the Bloch state, was observed to decrease below Tc. In the Zn-doped samples, a dramatic x-dependent temperature variation of was observed: from a decrease of Tb below Tc for x=0.01 to an increase of 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.

Original languageEnglish
Pages (from-to)1593-1596
Number of pages4
JournalPhysical review letters
Issue number13
Publication statusPublished - 1990

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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