Resistive upper critical field of thin films of underdoped <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>0.97</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>0.03</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>7</mn><mi mathvariant="normal">−</mi><mi mathvariant="normal">δ</mi></mrow></msub></mrow></math>

D. J. C. Walker; O. Laborde; A. P. Mackenzie; S. R. Julian; A. Carrington; J. W. Loram; J. R. Cooper

doi:10.1103/PhysRevB.51.9375

Resistive upper critical field of thin films of underdoped ${YBa}_{2}$ ( ${Cu}_{0.97}$ ${Zn}_{0.03}$ $)_{3}$ $O_{7 - δ}$

D. J. C. Walker, O. Laborde, A. P. Mackenzie, S. R. Julian, A. Carrington, J. W. Loram, and J. R. Cooper

Phys. Rev. B 51, 9375 – Published 1 April 1995

Abstract

We report measurements of the magnetic-field dependence of the superconducting transitions of a series of underdoped ${YBa}_{2}$ ( ${Cu}_{0.97}$ ${Zn}_{0.03}$ $)_{3}$ $O_{7 - δ}$ thin films with transition temperatures ( $T_{c}$ ) of 9.4, 12.5, 23, and 56.5 K. The ab-plane resistivity was measured in magnetic fields of up to 21 T applied both parallel and perpendicular to the c axis, at temperatures between 1.5 and 100 K, and for one sample down to 50 mK in fields of up to 16 T. The resistive critical field shows strong positive curvature all the way down to 0.006 $T_{c}$ , similar to that observed previously for overdoped ${Tl}_{2}$ ${Ba}_{2}$ ${CuO}_{6 + δ}$ single crystals.

Received 15 December 1994

DOI:https://doi.org/10.1103/PhysRevB.51.9375

Authors & Affiliations

D. J. C. Walker

Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom

O. Laborde

Centre de Recherche sur les Très Basses Températures, Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, 38042 Grenoble-cédex 9, France
Centre de Recherche sur les Très Basses Températures, Laboratoire des Champs Magnétiques Intenses, CNRS, Boîte Postale 166, 38042 Grenoble-cédex 9, France

A. P. Mackenzie

Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom

S. R. Julian

Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, United Kingdom

A. Carrington

Commissariat à l’Energie Atomique, Département de Recherche Fondamentale sur la Matière Condensée–SPSMS–LCP, 38054 Grenoble-cédex 9, France

J. W. Loram and J. R. Cooper

Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 OHE, United Kingdom

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Vol. 51, Iss. 14 — 1 April 1995

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