LEED-AES and XPS Studies of Bi-Sr-Ca-Cu-O Single Crystal Surfaces

Kishida, Satoru; Tokutaka, Heizō; Nakanishi, S.; Nishimori, Kentaro; Ishihara, Naganori; Fijimoto, Hiroshi

doi:10.1143/jjap.28.l406

Cited by 32 publications

(1 citation statement)

References 27 publications

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“…Â 10 À5 Pa. Further, q c obeys this law even when P BP is changed in only one instrument.Oxygen atoms in a cleaved Bi-O surface layer are removed more easily than other elements 24. One possible reason for this may be the adsorption of residual gas in the vacuum chamber on an unstable surface.…”

mentioning

confidence: 99%

Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

Ishida

Kato

Saito

et al. 2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Improvement in the quality of stacked intrinsic Josephson junctions (IJJs) was attempted using Bi 2 Sr 2 CaCu 2 O 8þd (Bi-2212) single crystals. The introduction of a clean Bi-2212/Au interface reduced contact resistivity (q c ), decreased low frequency noise, and suppressed the drop in the maximum Josephson current (I c ), which are very important factors for applications such as a superconducting quantum interference device. The q c of samples produced by crystal cleavage in air or vacuum were, respectively, 8.2 Â 10 À5 and 7.0 Â 10 À6 X cm 2 at 300 K and 8.2 Â 10 À5 and 2.1 Â 10 À6 X cm 2 at 77 K. Random-telegraph voltage noise observed with the air-cleaved samples did not occur for the samples cleaved in a vacuum. The degradation of I c was suppressed for IJJs produced by the vacuum cleavage process.

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mentioning

confidence: 99%

Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

Ishida

Kato

Saito

et al. 2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The Preparations of 110 K Pb-Doped BiSrCaCuO Superconducting Ceramics in Various Oxygen-Reduced Atmospheres

Kishida

Tokutaka

Futo

et al. 1991

Phys. Stat. Sol. (a)

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Deteriorated layer formed on Bi2Sr2CaCu2Oy single crystal surfaces

Kishida¹,

Tokimoto²,

Tokutaka³

et al. 1995

Phys. Stat. Sol. (a)

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Various deteriorated surfaces of Bi2Sr2CaCu2Oy single crystals are investigated by X‐ray photoelectron spectroscopy (XPS). From the results, it is found that the Ca 2p, 3/2 XPS peak position shifts to the higher‐energy side and its half‐width becomes broader by exposing the air‐cleaved surface of the crystal to an atmosphere of CO2. This indicates that CaCO3 is produced by CO2 gas exposure for 40 min. The valence state of Cu changes from 2+ to 1+ by air, O2, and CO2 gas exposure. Two XPS peaks at about 532 and 531 eV, which are probably related to the impurity oxides and carbonates, respectively, are observed in the XPS spectra of O 1 s core levels.

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LEED-AES and XPS Studies of Bi-Sr-Ca-Cu-O Single Crystal Surfaces

Cited by 32 publications

References 27 publications

Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

Improved characteristics of mesa-type intrinsic Josephson junctions by vacuum cleavage process for Bi2Sr2CaCu2O8+δ/Au contacts

The Preparations of 110 K Pb-Doped BiSrCaCuO Superconducting Ceramics in Various Oxygen-Reduced Atmospheres

Deteriorated layer formed on Bi2Sr2CaCu2Oy single crystal surfaces

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