Physical properties of single-phase high-Tc superconductor YBa2Cu3O7
Publication date
1987-12
Authors
Kadowaki, K.
Sprang, M. van
Huang, Y.K.
Koster, J.Q.A.
Meulen, H.P. van der
Tarnawski, Z.
Klaasse, J.C.P.
Menovsky, A.A.
Franse, J.J.M.
Miltenburg, J.C. van
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Abstract
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.