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VOLUME 96 (2012) | ISSUE 11 | PAGE 830
THz phonon spectroscopy of doped superconducting cuprates
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 АС 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.