Superconductivity of the HTS compounds Y1–<i>x</i>Ca<i>x</i>Ba2Cu4O8 ∓<i>y</i>
Vladimir I. MakarovPhysicotechnical Institute, KharkovVladimir KleinerPhysicotechnical Institute, KharkovO. N. OvcharenkoPhysicotechnical Institute, KharkovN. S. TereshinaPhysicotechnical Institute, KharkovA. A. BlinkinPhysicotechnical Institute, KharkovV. N. GolovinPhysicotechnical Institute, KharkovV. V. DerevyankoPhysicotechnical Institute, KharkovV. A. FinkelPhysicotechnical Institute, KharkovYu. N. ShakhovPhysicotechnical Institute, Kharkov
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Crystal lattice parameters of 1–2–4 compounds are measured as functions of calcium concentration in the interval 0&lt;x &lt;0.3. The degree of rhombic distortion of the crystal lattice is found to be nonlinear. The effect of hydrostatic pressure on the superconducting transition temperature of 1–2–4 compounds with a substitution of yttrium by calcium is studied. The dependence of Tc and the pressure derivative of Tc on calcium concentration (0&lt;x &lt;0.3) is found to be nonlinear. Possible mechanisms of the observed nonlinear dependences of Tc and dTc/dP on x are discussed.
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