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Title: Probing the density of states of high temperature superconductors with point contact tunneling spectroscopy
Authors: Özyüzer, Lütfi
Zasadzinski, John F.
Miyakawa, Nobuaki
Gray, Kenneth E.
Keywords: Tunneling spectroscopy
Issue Date: 2005
Publisher: Springer Verlag
Series/Report no.: Nato Science Series, Series ll: Mathematics, Physics and Chemistry
Abstract: Tunneling spectroscopy measurements are performed on single crystals of single CuO2 layer Tl2Ba2CuO6+delta, double CuO2 layer Bi2Sr2CaCu2O8+delta (Bi2212) and polycrystal quadruple CuO2 layer CuBa2Ca3Cu4O12+delta using the point contact tunneling technique. I-V and dI/dV-V characteristics are obtained at 4.2 K. In spite of different number of layers and T-c values, all three high-T-c superconductors exhibit similar spectral features including dip and hump features reminiscent of strong-coupling effects in conventional superconductors. The doping dependence of Bi2212 is studied and several effects of the hole concentration on spectral features are found. A novel effect is that the energy gap increases in the underdoped region even as T-c decreases. Combining the doping dependence of the energy gap and the dip energy provides additional information in order to understand the mechanism of high-T-c superconductivity. Point contact tunneling studies of the doping dependence of the energy gap in Bi2212 also helped to understand local variations of the gap magnitude observed by scanning tunneling microscopy, indicating that this type of spectroscopy is an integral part of the tunneling technique.
Description: Conference of the NATO-Advanced-Study-Institute on Scanning Probe Microscopy
ISBN: 1-4020-3017-7
Appears in Collections:Physics / Fizik
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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