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High-Tc superconductor near the S–I transition |
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| Authors: | T Kasai H Nakajima T Fujii I Terasaki T Watanabe H Shibata A Matsuda |
| Institution: | aDepartment of Physics, Waseda University, Okubo 3-4-1, Shinjuku-ku, Tokyo 169-8555, Japan;bCryogenic Research Center, The University of Tokyo, 2-11-16 yayoi, Bunkyo-ku, Tokyo 113-0032, Japan;cDepartment of Advanced Physics, Hirosaki University, 3 bunkyo-cho, Hirosaki, Aomori 036-8561, Japan;dNTT Basic Research Laboratories, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-01, Japan |
| Abstract: | We report on the density of states measurements of Bi2212 (Bi2+xSrxCaCu2O8+δ) near the superconductivity-insulator transition using a low temperature scanning tunneling microscope. We prepared highly underdoped Bi rich Bi2212 single crystals (Tc  32 K). The energy gap distribution did not provide an energy scale proportional to Tc. Averaged tunnel spectra with various doping levels were scaled into a single line if energy was normalized by their respective gap values. This indicated there was no crossover energy, which separates a pseudogap and a superconducting gap. |
| Keywords: | Superconductor Bi2212 STM Underdoped |
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