Subgap structures in the current-voltage characteristic of the intrinsic Josephson effect due to phonons
Ch. Helm, Ch. Preis, F. Forsthofer, J. Keller, K. Schlenga, R. Kleiner, P. Müller
Abstract
A modified RSJ-model for the coupling of intrinsic Josephson oscillations and c-axis phonons in the high-Tc superconductors Tl2Ba2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ is deveoped. This provides a very good explanation for recently reported subgap structures in the I-V-characteristic of the c-axis transport. It turns out that the voltages of these structures coincide with the eigenfrequencies of longitudinal optical phonons, providing a new measurement technique for this quantity. The significantly enhanced microwave emission at the subgap structures in both the GHz and THz region is discussed.
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