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


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.

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Correspondence to A. F. Hebard.

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Hebard, A.F., Eick, R.H., Siegrist, T. et al. Ion Beam Thinning of YBa2cu3o7 Films: Approach to a Limiting Thickness for Superconductivity of One Lattice Constant. MRS Online Proceedings Library 169, 565–568 (1989).

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