Zeitschrift für Physik B Condensed Matter

, Volume 67, Issue 3, pp 275–283 | Cite as

High temperature superconductivity research at the IBM thomas J. Watson and Almaden research centers

  • A. P. Malozemoff
  • P. M. Grant
Article
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Abstract

Complementing the work of Bednorz and Müller, which started the field of high temperature oxide superconductivity, the IBM Research laboratories at Yorktown Heights in Almaden have made contributions also via many outside collaborations across the full scope of this field. Materials work includes the identification, separation and structural characterization of the YBa2Cu3O7−x phase, the detection of superconductivity and antiferromagnetism in La2CuO4, and the deposition of YBaCuO films with transition temperatures above 77 K by electron-beam deposition and plasma spraying. Characterization work includes measurement of the superconducting energy gap by far-infrared and tunneling measurements, study of Meissner and diamagnetic shielding, observation of superconducting fluctuations, correlation of [Cu−O]+ complex concentration withTc, and determination of valence electronic structure by photoemission. Theoretical work includes proposal of an interband scattering mechanism for superconductivity, a mean-field solution to an electron-interaction model, band-structure calculations, and a phenomenological model for lattice parameters and their influence onTc. YBa2CU3O7−d single crystals have been synthesized and shown to exhibit up to 70:1 magnetic anisotropy. In work of relevance to applications, the first thin film SQUIDs have been operated in temperatures up to 68 K, epitaxial films on SrTiO3 have been found to sustain critical currents of more than 105 A/cm2 at 77 K, and coatings, superconducting above 77 K, have been deposited by plasma spraying.

Keywords

Magnetic Anisotropy High Temperature Superconductivity High Temperature Oxide Epitaxial Film La2CuO4 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • A. P. Malozemoff
    • 1
  • P. M. Grant
    • 2
  1. 1.IBM Thomas J. Watson Research CenterYorktown HeightsUSA
  2. 2.IBM Almaden Research CenterSan JoseUSA

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