Abstract
The dependence of the superconducting (Meissner) phase volume V m on the YBa2Cu3O6+δ doping level was studied. It was found that V m monotonically decreases as the doping level is lowered and vanishes at the same value of δ ∼ 0.3 as Tc does. It was concluded that the Tc decrease and the increase in the pseudogap formation temperature T* as the doping level is lowered are caused by a decrease in the average size of superconducting clusters. This conclusion suggests an extraordinary superconductivity mechanism in HTSC.
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Original Russian Text © K.V. Mitsen, O.M. Ivanenko, S.Yu. Burkin, 2007, published in Kratkie Soobshcheniya po Fizike, 2007, Vol. 34, No. 6, pp. 18–28.
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Mitsen, K.V., Ivanenko, O.M. & Burkin, S.Y. Meissner effect in the underdoped YBa2Cu3O6+δ HTSC phase. Bull. Lebedev Phys. Inst. 34, 168–173 (2007). https://doi.org/10.3103/S1068335607060036
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DOI: https://doi.org/10.3103/S1068335607060036