STM measurements of Ni impurity effects in Bi2212

A. Nakagawa, T. Sakaidani, Y. Kiguchi, T. Uto, Azusa Matsuda

    Research output: Contribution to journalConference article

    Abstract

    We report on the STS measurements for the temperature dependences of density-of-states for optimally-doped and overdoped samples. In the tunnelling spectra above TC in an overdoped sample, we found two types of a pseudogap; the large one, which had a typical pseudogap size and decreased with increasing a temperature, and the small one, which seemed almost temperature independent in our measured temperature range. The large gap seemed to switch to the small one with some overlap region with increasing a temperature. Similar behaviour was found in the optimally doped samples with an enhanced gap size and the temperature range. We identified the large gap as a conventional pseudogap and the small one as a new pseudogap, which is associated with Ni impurity. This shows a peculiarity of Ni impurity, and suggests an unusual interaction between an impurity and the Cu-O electronic system.

    Original languageEnglish
    Article number012012
    JournalJournal of Physics: Conference Series
    Volume871
    Issue number1
    DOIs
    Publication statusPublished - 2017 Jul 26
    Event29th International Symposium on Superconductivity, ISS 2016 - Tokyo, Japan
    Duration: 2016 Dec 132016 Dec 15

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    impurities
    temperature
    space transportation system
    switches
    temperature dependence
    electronics
    interactions

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    STM measurements of Ni impurity effects in Bi2212. / Nakagawa, A.; Sakaidani, T.; Kiguchi, Y.; Uto, T.; Matsuda, Azusa.

    In: Journal of Physics: Conference Series, Vol. 871, No. 1, 012012, 26.07.2017.

    Research output: Contribution to journalConference article

    Nakagawa, A. ; Sakaidani, T. ; Kiguchi, Y. ; Uto, T. ; Matsuda, Azusa. / STM measurements of Ni impurity effects in Bi2212. In: Journal of Physics: Conference Series. 2017 ; Vol. 871, No. 1.
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    AU - Kiguchi, Y.

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    AU - Matsuda, Azusa

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