Structure and peculiarities of the superconducting transition in weakly orthorhombic YBa2Cu3−<i>x</i>O7−<i>y</i> crystals
V. V. MitkevichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. V. DemirskiĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovS. A. Vasil’chenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovВ. І. ДоценкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Аннотация
Comprehensive structural investigations are carried out directly in a crystal in which a transition to the superconducting state has been registered. Inductive measurements using alternating current in a single crystal reveal a double superconducting transition with Tcl = 92 K and Tc2 = 40 K. For the observed orthorhombicity of 0.019(1) Å in the investigated crystal, the filling of positions O2 and O3 by oxygen is 0.4 and 0.3 respectively, so that the formation of Cu–O chains of an appreciable length is not possible along any axis.
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