Temperature dependence of upper critical fields and coherence lengths for optimally-doped YBa2Cu3O7-δthin films
Petrenko E.V. Omelchenko L.V. Terekhov A.V. Kolesnichenko Yu.A. Rogacki K. Sergeyev D.M. Solovjov A.L.
1 October 2022American Institute of Physics Inc.
Low Temperature Physics
2022#48Issue 10755 - 762 pp.
We report the comprehensive comparative analysis of the upper critical magnetic fields μHc2(0) obtained within Ginzburg-Landau (GL) and Werthamer-Helfand-Hohenberg (WHH) theories for optimally-doped YBa2Cu3O7-δ thin films. For different orientations of the magnetic field, our calculations give 638 and 153 T for μHc2(0), H || ab and μHc2(0), H || c, respectively, when using Hc2(0). For the first time, the temperature dependences of coherence lengths ζab(T) and ζc(T) within proposed theories were determined using 50 and 90% criteria of the normal state resistivity value ρN. The GL (0.9ρN) approach gives ζab(0) = 11.8 Å and ζc(0) = 3.0 Å which are in a good agreement with literature data. The implications of very short coherence lengths in HTSCs are discussed.
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B. Verkin Institute for Low Temperature Physics and Engineering, The National Academy of Sciences of Ukraine, Kharkiv, 61103, Ukraine
Institute for Low Temperatures and Structure Research, Polish Academy of Sciences, Wroclaw, 50-950, Poland
K. Zhubanov Aktobe Regional State University, Aktobe, 030000, Kazakhstan
The Faculty of Physics, V. N. Karazin Kharkiv National University, Kharkiv, 61022, Ukraine
B. Verkin Institute for Low Temperature Physics and Engineering
Institute for Low Temperatures and Structure Research
K. Zhubanov Aktobe Regional State University
The Faculty of Physics
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