Phonon echo probing of high-temperature superconductors containing magnetic ions



: Pleshakov IV, Nechitailov AA, Paugurt AP, Matveev VV, Fofanov YA, Ylinen E

Publisher: MAIK NAUKA/INTERPERIODICA/SPRINGER

: 2007

Pis'ma v Zhurnal Tekhnicheskoi Fiziki / Technical Physics Letters

TECHNICAL PHYSICS LETTERS

: TECH PHYS LETT+

: 33

: 12

: 1050

: 1053

: 4

: 1063-7850

DOI: https://doi.org/10.1134/S106378500712019X


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.



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