Terahertz phonon spectroscopy of doped superconducting cuprates |
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| Authors: | Ya. G. Ponomarev H. H. Van S. A. Kuzmichev S. V. Kulbachinskii M. G. Mikheev M. V. Sudakova S. N. Tchesnokov |
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| Affiliation: | 1. Department of Low Temperature Physics, Moscow State University, Moscow, 119991, Russia
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| Abstract: | ![]()
Facts are presented evidencing a strong electron-phonon interaction in doped BSCCO superconductors. A pronounced fine structure in dI/dV characteristics of Josephson junctions has been observed which is caused by interaction of AC Josephson current with Raman-active optical phonon modes. “Quantization” of the “gap” voltage for natural nanosteps on the cryogenically cleaved surfaces of BSCCO proves the existence of the intrinsic Josephson effect. A sharp extra structure in the current-voltage characteristics of nanosteps is attributed to the presence of the extended van Hove singularity. |
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