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Ion Beam Thinning of YBa2cu3o7 Films: Approach to a Limiting Thickness for Superconductivity of One Lattice Constant

Published online by Cambridge University Press:  28 February 2011

A.F. Hebard ,
R. H. Eick ,
T. Siegrist  and
E. Coleman
A.F. Hebard
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
R. H. Eick
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
T. Siegrist
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
E. Coleman
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

Grazing angle ion-beam milling of c-axis oriented YBa2Cu3O7 films is shown to give smooth films which have metallic-like resistance transitions and superconduct at thicknesses approaching a lattice constant. The zero resistance transition temperature decreases uniformly with increased milling with most of the change occurring for thicknesses less than 100Å. The crossover to non-superconducting behavior occurs at “electrical” thicknesses near 10 Å with a sheet resistance above the onset of the superconducting transition having a value near h/4e2 = 6450Ω, a combination of fundamental constants predicted by theory and observed previously in low-Tc superconductors. Continued milling beyond this limit results in semiconducting behavior without a superconducting transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 565
Copyright
Copyright © Materials Research Society 1990

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References

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