STM/STS study of electronic states in highly underdoped Bi2212

T. Kasai, S. Yamashita, H. Nakajima, T. Fujii, I. Terasaki, T. Watanabe, H. Shibata, Azusa Matsuda

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Local density of states (LDOS) and the lattice structure of highly underdoped Bi2Sr2CaCu2O8+ δ with Tc = 22 K and 30 K were investigated by a low temperature scanning tunneling microscope. The modulation structure of the Bi-O surface was strongly depressed in the highly underdoped samples. The depression was observed only in the samples subject to the strong reduction annealing process, suggesting that the strong reduction in excess oxygen could destroy the modulation structure. At a time, patch-like inhomogeneity in the gap map sometimes disappeared, indicating that the existence of excess oxygen has an important role in the patch formation. Analysis on the LDOS with various doping levels showed that there was no crossover energy, which separates a pseudogap and a superconducting gap and is proportional to Tc.

    Original languageEnglish
    JournalPhysica C: Superconductivity and its Applications
    Volume470
    Issue numberSUPPL.1
    DOIs
    Publication statusPublished - 2010 Dec

    Fingerprint

    space transportation system
    Electronic states
    Modulation
    Oxygen
    modulation
    oxygen
    electronics
    crossovers
    inhomogeneity
    Microscopes
    microscopes
    Doping (additives)
    Annealing
    Scanning
    annealing
    scanning
    Temperature
    energy

    Keywords

    • Bi2212
    • STM
    • Underdoped

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology
    • Electronic, Optical and Magnetic Materials

    Cite this

    STM/STS study of electronic states in highly underdoped Bi2212. / Kasai, T.; Yamashita, S.; Nakajima, H.; Fujii, T.; Terasaki, I.; Watanabe, T.; Shibata, H.; Matsuda, Azusa.

    In: Physica C: Superconductivity and its Applications, Vol. 470, No. SUPPL.1, 12.2010.

    Research output: Contribution to journalArticle

    Kasai, T, Yamashita, S, Nakajima, H, Fujii, T, Terasaki, I, Watanabe, T, Shibata, H & Matsuda, A 2010, 'STM/STS study of electronic states in highly underdoped Bi2212', Physica C: Superconductivity and its Applications, vol. 470, no. SUPPL.1. https://doi.org/10.1016/j.physc.2009.11.148
    Kasai, T. ; Yamashita, S. ; Nakajima, H. ; Fujii, T. ; Terasaki, I. ; Watanabe, T. ; Shibata, H. ; Matsuda, Azusa. / STM/STS study of electronic states in highly underdoped Bi2212. In: Physica C: Superconductivity and its Applications. 2010 ; Vol. 470, No. SUPPL.1.
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    AU - Watanabe, T.

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