4 papers
Subgap structures in the current-voltage characteristic of the intrinsic Josephson effect due to phonons
Ch. Helm, Ch. Preis, F. Forsthofer +4
A modified RSJ-model for the coupling of intrinsic Josephson oscillations and c-axis phonons in the high-T_c superconductors Tl_2Ba_2Ca_2Cu_3O_{10+δ} and Bi_2Sr_2CaCu_2O_{8+δ} is d…
Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors
Ch. Helm, Ch. Preis, F. Forsthofer +4
The recently reported subgap structures observed in the current-voltage characteristic of intrinsic Josephson junctions in the high-T_c superconductors Tl_2Ba_2Ca_2Cu_3O_{10+δ} and…
Collective Spin Modes in Superconducting Double Layers
Christian Helm, Franz Forsthofer, Joachim Keller
We investigate a double layer system with tight-binding hopping, intra-layer and inter-layer interactions, as well as a Josephson like coupling. We find that an antiferromagnetic s…
Frequency Shifts and Linewidth Changes of Infrared-Active Phonons in Double-Layered High-Temperature Superconductors
G. Hastreiter, F. Forsthofer, J. Keller
We calculate frequency shifts and changes in linewidths of infrared-active phonons within a shell model for the bare phononic system coupled to an electronic double-layer structure…