论文信息 - Subgap structures in intrinsic Josephson junctions of Tl2Ba2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ

Subgap structures in intrinsic Josephson junctions of Tl2Ba2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ

The current voltage characteristics of intrinsic Josephson junctions in thin films of Tl2Ba2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ single crystals show pronounced subgap structures at voltages well below the gap. These voltages are independent of sample geometry, magnetic field and temperature up to 0.5 Tc. We discuss possible explanations and show that the structures could be explained by a peak in the quasiparticle contribution to the total current. For superconducting superlattices a subgap peak in the quasiparticle density of states has been predicted theoretically and could explaine our results.

[1] Kleiner,et al. Intrinsic Josephson effects in Bi2Sr2CaCu2O8 single crystals. , 1992, Physical review letters.

[2] K. Kitazawa,et al. Single Crystal Growth of Bi2Sr2Can-1CunOy Superconductors by the Floating Zone Method , 1989 .

[3] A. V. Gelder. ENERGY GAPS IN THE EXCITATION SPECTRUM OF A SUPERCONDUCTOR. , 1969 .

[4] Wacker,et al. Electronic structure of superconducting multilayers. , 1994, Physical review. B, Condensed matter.

[5] A. Hahn. Quasiparticles in a periodic pair potential: A density of states model for YBa2Cu3O7 , 1990 .

[6] K. Schlenga,et al. Intrinsic Josephson junctions in high-T/sub c/ superconductors as high frequency sources , 1995, IEEE Transactions on Applied Superconductivity.