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Title: Tunneling spectroscopy of heavily underdoped crystals of Bi2Sr2CaCu2O8-?
Authors: Özyüzer, Lütfi
Zasadzinski, John F.
Miyakawa, Nobuaki
Kendziora, Christopher A.
Sha, J.
Hinks, David G.
Gray, Kenneth E.
Özyüzer, Lütfi
Izmir Institute of Technology. Physics
Keywords: Oxide superconductors
Doping (additives)
Energy gap
Superconducting gap
Tunneling spectroscopy
Issue Date: Nov-2000
Publisher: Elsevier Ltd.
Source: Özyüzer, L., Zasadzinski, J. F., Miyakawa, N., Kendziora, C. A., Sha, J., Hinks, D. G., and Gray, K. E. (2000). Tunneling spectroscopy of heavily underdoped crystals of Bi2Sr2CaCu2O8-δ. Physica C: Superconductivity and its Applications, 341-348(PART 3), 927-928. doi:10.1016/S0921-4534(00)00739-5
Abstract: Crystals of Bi2Sr2CaCu2O8+δ with optimal Tc=95 K have been underdoped using two different methods and the superconducting gaps have been obtained by tunneling. In some cases, three different tunneling geometries have been utilized: point contact, STM and break junctions. The first doping method involves control of the oxygen content by annealing in various partial pressures of oxygen. These crystals exhibit a narrow spread of gap values over a wide doping range from overdoped (Tc=56 K) to underdoped with Tc=70 K. However, for underdoped crystals with Tc midpoints in the range 25 K - 63 K, there is a dramatic increase in the spread of gap values which may signal the development of static phase separation of either chemical or electronic origin. To avoid possible chemical phase separation, we have explored another doping procedure which incorporates Dy substitution on the Ca site. These crystals exhibit a relatively narrow superconducting transition width and some preliminary tunneling spectra will be presented.
ISSN: 0921-4534
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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