Temperature dependence of the in-plane penetration depth of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>6.95</mn></mrow></msub></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math>(<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>0.9985</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Zn</mi></mrow><mrow><mn>0.0015</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>6.95</mn></mrow></msub></mrow></math> crystals from T to <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="italic">T</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>

D. Achkir; M. Poirier; D. A. Bonn; Ruixing Liang; W. N. Hardy

doi:10.1103/PhysRevB.48.13184

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Temperature dependence of the in-plane penetration depth of ${YBa}_{2}$ ${Cu}_{3}$ $O_{6.95}$ and ${YBa}_{2}$ ( ${Cu}_{0.9985}$ ${Zn}_{0.0015}$ $)_{3}$ $O_{6.95}$ crystals from T to $T^{2}$

D. Achkir, M. Poirier, D. A. Bonn, Ruixing Liang, and W. N. Hardy

Phys. Rev. B 48, 13184(R) – Published 1 November 1993

Abstract

The low-temperature dependence of the microwave complex surface impedance (17 GHz) of pure and Zn-doped high-quality YBCO single crystals is reported. The surface resistance of the pure crystal shows a peaked structure around 40 K which disappears with Zn doping. The in-plane penetration depth varies linearly with temperature below 25 K; a $T^{2}$ contribution appears at the lowest temperature when Zn impurities are added. This suggests that the former temperature dependence is intrinsic to pure crystals whereas the $T^{2}$ behavior, also observed in thin films, would be due to defects. The linear temperature dependence is expected for superconducting gaps with lines of nodes.

Received 9 August 1993

DOI:https://doi.org/10.1103/PhysRevB.48.13184

Authors & Affiliations

D. Achkir and M. Poirier

Centre de Recherche en Physique du Solide, Département de Physique, Université de Sherbrooke, Québec, Canada J1K 2R1

D. A. Bonn, Ruixing Liang, and W. N. Hardy

Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

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Vol. 48, Iss. 17 — 1 November 1993

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