Optically induced changes and long-term relaxations of resistivity and critical temperature in He⁺ irradiated YBa₂Cu₃O_x

Author(s)

Wilhelm Markowitsch, Bernd Steiger, Wolfgang Lang, Marius Bodea, Johannes D. Pedarnig

Abstract

Thin films of YBa₂Cu₃O_x with superconducting critical temperatures (T_c) ranging from 58 K to 72 K prepared by pulsed-laser deposition and subsequent irradiation with 75 keV He ions. Optical the films with a He-Ne laser resulted in a small resistivity reduction, when the experiment was carried short period of time after the ion irradiation. The value of T_c, was essentially unchanged by the treatment. Further light excitation experiments did not show a significant effect on the resistivity samples. We conclude that ion-irradiated metallic YBa₂Cu₃O_x does not exhibit the persistent conductivity observed in oxygen-depleted samples with comparable critical temperatures. On the hand we have observed a long-term relaxation of T_c, towards larger values that takes place even when samples are kept in the dark. Our results indicate that T_c, may increase after ion irradiation to an value about 20% over the initial value on a typical time scale of years. This observation may be possible applications of light-ion irradiated YBa₂Cu₃O_x.

Organisation(s)

Electronic Properties of Materials

External organisation(s)

Johannes Kepler Universität Linz

Journal

Thin Solid Films

Volume

518

Pages

7070-7074

No. of pages

5

ISSN

0040-6090

DOI

https://doi.org/10.1016/j.tsf.2010.06.033

Publication date

2010

Peer reviewed

Yes

Austrian Fields of Science 2012

103018 Materials physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/68f9b505-30f9-4b12-bcac-e906beec8c70