Scientific article

Positron trapping in Y1-xPrxBa2Cu3O7-δ and the Fermi surface of YBa2Cu3O7-δ

Published inPhysical Review. B, Condensed Matter, vol. 51, no. 9, p. 6028-6034
Publication date1995

Temperature-dependent positron lifetime measurements in ceramic Y1−xPrxBa2Cu3O7−δ samples reveal positron trapping, in particular at low temperature and for small x. Positrons appear to be completely delocalized for T∼400 K and higher. At high temperatures the lifetime for YBa2Cu3O7−δ and PrBa2Cu3O7−δ is identical (∼165 ps) and close to the theoretical value. For these reasons a two-dimensional angular correlation of annihilation radiation (2D-ACAR) spectrum was measured in YBa2Cu3O7 at T=400 K. The spectrum width confirms the delocalization of the positron and the 2D-ACAR shows, apart from the one-dimensional Fermi surface due to CuO chains, a smaller Fermi surface sheet centered around the S point, in the first Brillouin zone.

Citation (ISO format)
SHUKLA, Abhay Shrirang et al. Positron trapping in Y<sub>1-x</sub>Pr<sub>x</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> and the Fermi surface of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>. In: Physical Review. B, Condensed Matter, 1995, vol. 51, n° 9, p. 6028–6034. doi: 10.1103/PhysRevB.51.6028
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Article (Published version)
ISSN of the journal1098-0121

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