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Scanning tunneling spectroscopy on high Tc superconductors

Hasegawa, T. ; Nantoh, M. ; Heike, S. ; [et al.]

Amsterdam : Elsevier

Journal of Physics and Chemistry of Solids 54 (1993), S. 1351-1357

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ISSN: 0022-3697

Keywords: STM ; superconducting gap ; tunneling spectroscopy

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Chemistry and Pharmacology , Physics

Type of Medium: Electronic Resource

URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(93)90193-U

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STM tunneling spectroscopy on high Tc superconductors (1995)

Hasegawa, T. ; Nantoh, M. ; Ogino, M. ; [et al.]

Springer

Journal of superconductivity 8 (1995), S. 467-470

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ISSN: 1572-9605

Keywords: STM ; superconducting gap ; symmetry of order parameter

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract STM tunneling spectroscopy has been performed on the bulk single crystals of BiSrCaCuO (BSCCO) and the epitaxial thin films of YBaCuO (YBCO) at cryogenic temperatures. The STM images and tunneling spectra observed on the (001) surfaces can be classified into three cases; 1) Atomic image is visible. However, the tunneling spectrum shows semiconducting or smeared superconducting gap structures, depending on the tip-sample distance. 2) Clear atomic image can not be obtained. But, the tunneling spectrum shows flat bottom region with quite low zero bias conductance. 3) Tunneling spectra demonstrate gapless behavior, independent of the tip-sample separation. These observations support the quasi-2D electronic picture in whichs-wave like 2D superconducting layers are coupled with each other through the Josephson effect.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00722832

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Influence of doping on the electronic structure of (La, Sr)2CuO4 (1994)

Howell, R. H. ; Sterne, P. A. ; Fluss, M. J. ; [et al.]

Springer

Journal of superconductivity 7 (1994), S. 169-173

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ISSN: 1572-9605

Keywords: La2−x Sr x CuO4 ; positron annihilation ; ACAR ; Fermi surface ; Sr doping ; electronic structure

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract High-statistics (〉4 × 108 counts), room-temperature measurements of the electron-positron momentum density of La2−x Sr x CuO4 have been performed for samples with Sr concentrations of x=0.0, 0.1, 0.13, and 0.2. These spectra have been analyzed in conjunction with theoretical calculations of the electron-positron momentum density. The metallic samples show features consistent with the presence of a Fermi surface, but its evolution with increasing Sr concentration does not follow the predictions of band theory. These results may indicate the effects of electron-electron correlation on the electron momentum distribution in the Cu-O plane.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00730389

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