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Universal critical behavior in single crystals and films of YBa2Cu3O7-Hua Xu, Su Li, Steven M. Anlage, and C. J. Lobb*

Summary: Universal critical behavior in single crystals and films of YBa2Cu3O7-
Hua Xu, Su Li, Steven M. Anlage, and C. J. Lobb*
Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland,
College Park, Maryland 20742-4111, USA
M. C. Sullivan
Department of Physics, Ithaca College, Ithaca, New York 14850, USA
Kouji Segawa and Yoichi Ando
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
Received 21 July 2009; published 30 September 2009; corrected 6 October 2009
We have studied the normal-to-superconducting phase transition in optimally doped YBa2Cu3O7- in zero
external magnetic field using a variety of different samples and techniques. Using dc transport measurements,
we find that the dynamical critical exponent z=1.54 0.14, and the static critical exponent =0.66 0.10 for
both films when finite-thickness effects are included in the data analysis and single crystals where finite-
thickness effects are unimportant . We also measured thin films at different microwave frequencies and at
different powers, which allowed us to systematically probe different length scales to avoid finite-thickness
effects. dc transport measurements were also performed on the films used in the microwave experiments to
provide a further consistency check. These microwave and dc measurements yielded a value of z consistent
with the other results, z=1.55 0.15. The neglect of finite-thickness, finite-current, and finite-frequency effects
may account for the wide ranges of values for and z previously reported in the literature.
DOI: 10.1103/PhysRevB.80.104518 PACS number s : 74.40. k, 74.25.Dw, 74.25.Fy, 74.72.Bk


Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park


Collections: Materials Science