Abstract
A superconducting transition in the temperature dependence of the ab-plane resistivity of underdoped YBa2Cu3O6+x crystals in the range T c≲30 K has been investigated. Unlike the case of samples with the optimal level of doping, the transition width increased insignificantly with magnetic field, and in the range T≲13 K it decreased with increasing magnetic field. The transition point T c(B) was determined by analyzing the fluctuation conductivity. The curves of B c2(T) measured in the region T/T c≳0.1 did not show a tendency to saturation and had a positive second derivative everywhere, including the immediate neighborhood of T c. The only difference among the curves of B c2(T) for different crystal states is the scales of Tand B, so they can be described in terms of a universal function, which fairly closely follows Alexandrov’s model of boson superconductivity.
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Zh. Éksp. Teor. Fiz. 115, 268–284 (January 1999)
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Gantmakher, V.F., Tsydynzhapov, G.E., Kozeeva, L.P. et al. Resistive transition and upper critical field in underdoped YBa2Cu3O6+x single crystals. J. Exp. Theor. Phys. 88, 148–156 (1999). https://doi.org/10.1134/1.558777
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DOI: https://doi.org/10.1134/1.558777