Improved superconducting properties of SmBa₂Cu₃O_7−δ films using YBa₂Cu₃O_7−δ buffer layers

C. Kwon Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA; Department of Physics and Astronomy, California State University, Long Beach, CA, 90840-3901, USA E-mail: [email protected]

L. R. Kinder Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

Y Fan Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

Y Gim Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

A. T. Findikoglu Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

J. F. Bingert Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

J. Y. Coulter Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

S. R. Foltyn Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

D. E. Petersonand Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

Q. X. Jia Materials Science and Technology Division, Mail stop K763, Los Alarnos National Laboratory, Los Alamos, New Mexico, 87545, USA

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Abstract

We report the fabrication of SmBa₂Cu₃O_7−δ (Sm123) films on YBa₂Cu₃0_7−δ(Y123) buffer layers 10–20nm thick using pulsed-laser deposition. Significant improvement in the superconducting properties of Sm 123 such as T_c and J_c has been observed when Y123 buffer layers are used on various substrates (LaAlO₃, SrTiO₃, NdGaO₃ and CeO₂/(yttrium-stabilized zirconia)). The buffered Sm 123 films have a high T_c of 93.1 K and a high J_c of 1.9 × 10⁶ Acm⁻² at 75 K in zero magnetic field. Compared with Y123, the buffered Sm123 samples have com-parable microwave surface resistance values and pinning characteristics with reduced anisotropy measured by the angle-dependent I_c. The effects of the Y123 buffer layer on the superconducting properties of Sm 123 are investigated and discussed in relation to the initial film growth chemistry and the substitution of Sm on Ba sites.

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Improved superconducting properties of SmBa₂Cu₃O_7−δ films using YBa₂Cu₃O_7−δ buffer layers

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Improved superconducting properties of SmBa₂Cu₃O_7−δ films using YBa₂Cu₃O_7−δ buffer layers