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Scientific article
English

Positron Trapping and Fermi Surface Studies in (R)Ba2Cu3O7-δ

Published inMaterials Science Forum, vol. 175-178, p. 929-932
Publication date1995
Abstract

Temperature dependent positron lifetime measurements in Y1-xPrxBa2Cu3O7-δ are discussed, and reveal positron trapping at low temperature (T<400K) and for small x. Therefore YBa2Cu3O7 was measured by 2D-ACAR at T=450K, showing clearly the 'pillbox' Fermi surface. We also studied in detail the 3D 'ridge' Fermi surface in DyBa2Cu3O7-δ and compared it with theory. In oxygen deficient YBa2Cu3O7-δ, the ridge disappears for increasing δ without change in width, which is consistent with the phase separation model of Mesot et al.

Keywords
  • Angular correlatton (2D-ACAR)
  • Lifetime measurements
  • Fermi surface
  • Vacancy
  • High Tc superconductors
Citation (ISO format)
SHUKLA, Abhay Shrirang et al. Positron Trapping and Fermi Surface Studies in (R)Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>. In: Materials Science Forum, 1995, vol. 175-178, p. 929–932. doi: 10.4028/www.scientific.net/MSF.175-178.929
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ISSN of the journal0255-5476
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