Phonon echo probing of high-temperature superconductors containing magnetic ions.

Pleshakov, I. V.; Nechitaĭlov, A. A.; Paugurt, A. P.; Matveev, V. V.; Fofanov, Ya. A.; Ylinen, Eero

Polycrystalline high-temperature superconductors (HTSCs) containing iron and gadolinium ions have been studied using the phonon echo technique, whereby a powdered sample is probed by a special sequence of RF pulses and the response having an acoustic nature is measured. It is shown that the behavior of this signal in the iron-containing HTSC materials exhibits some distinctive features in comparison to the response of a conventional yttrium-based ceramic. The superconducting gap estimated for the samples with magnetic ions does not differ significantly from the value for a usual HTSC. This fact is related to a spatial separation of the magnetic and superconducting phases in the materials studied.

MAGNETIC ions; SUPERCONDUCTORS; IRON ions; PHONONS; RADIO frequency; CERAMICS

Technical Physics Letters, 2007, Vol 33, Issue 12, p1050

1063-7850

Academic Journal

10.1134/S106378500712019X