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The gold/high temperature superconductor interface; metallicity of the near surface region and a search for the proximity effect

 

作者: D. S. Dessau,   Z.‐X. Shen,   B. O. Wells,   W. E. Spicer,   R. S. List,   A. J. Arko,   R. J. Bartlett,   C. G. Olson,   D. B. Mitzi,   C. B. Eom,   A. Kapitulnik,   T. H. Geballe,  

 

期刊: Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films  （AIP Available online 1991）
卷期: Volume 9, issue 3  

页码: 383-389

 

ISSN:0734-2101

 

年代: 1991

 

DOI:10.1116/1.577418

 

出版商: American Vacuum Society

 

关键词: GOLD;HIGH−TC SUPERCONDUCTORS;INTERFACES;ELECTRONIC STRUCTURE;MONOCRYSTALS;VERY LOW TEMPERATURE;VAPOR DEPOSITED COATINGS;PHOTOELECTRON SPECTROSCOPY;ULTRAHIGH VACUUM;FERMI LEVEL;SYNCHROTRON RADIATION;PROXIMITY EFFECT;Au;EuBa2Cu3O7;Bi2Sr2CaCu2O8

 

数据来源: AIP

 

摘要:

We have used high resolution photoemission spectroscopy to probe the electronic structure of a wide variety of gold/high temperature superconductor interfaces, the majority of which were formed by low‐temperature (20 K) gold evaporations on cleaved high quality single crystals. Forc‐axis interfaces formed on the 123 family of superconductors, we find that the gold deposition essentially destroys the metallicity of the superconducting substrate in the near surface region (∼5 Å), while the near surface region of Bi2Sr2CaCu2O8remains metallic. We have also used photoemission spectroscopy to search for a proximity‐effect induced superconducting gap in gold overlayers onc‐axis single crystals anda‐axis thin films, though no such effect was found.

 

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