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Physical properties of single-phase high-Tc superconductor YBa2Cu3O7

By K. Kadowaki, M. van Sprang, Y.K. Huang, J.Q.A. Koster, H.P. van der Meulen, Z. Tarnawski, J.C.P. Klaasse, A.A. Menovsky, J.J.M. Franse, J.C. van Miltenburg, A. Schuijff, T.T.M. Palstra, R. de Ruiter, P.W. Lednor and H. Barten


Transport and thermodynamical properties as well as structural investigations in the well-characterized 90 K-class high-Tc superconductor YBa2Cu3O7 are presented, especially in relation to the fundamental mechanism of the high-Tc superconductivity. High-precision specific heat measurements around Tc=91.8 K reveal that the value of ΔC/Tc is 48±2 mJ/mol K2. This value results in the fact that the value of ΔC/γTc is 1.33, which is close to 1.43, the weak-coupling BCS value, provided that the coefficient, γ, of the linear term in the specific heat is 36±2 mJ/mol K2

Topics: Natuur- en Sterrenkunde
Year: 1987
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