https://doi.org/10.1140/epjb/e2004-00323-6
Microwave properties of Ba0.6K0.4BiO3 crystals
1
INFM and Dipartimento di Scienze
Fisiche e Astronomiche, Universit di Palermo,
Via Archirafi 36, 90123 Palermo, Italy
2
Institute of Solid
State Physics, Chernogolovka, Moscow District 142432, Russia
Corresponding author: a agliolo@fisica.unipa.it
Received:
6
May
2004
Revised:
29
July
2004
Published online:
21
October
2004
We report on field-induced variations of the microwave
surface resistance at 9.6 GHz of Ba0.6K0.4BiO3
crystals. Energy losses have been investigated as a function of
the static magnetic field in the range of temperatures 4.2 K
. By analyzing the experimental results in the
framework of the Coffey and Clem model we determine the
temperature dependence of the first-penetration field, upper
critical field and depinning frequency. The results show that the
pinning energy of this bismuthate superconductor is weaker than
those of cuprates.
PACS: 74.25.Ha – Magnetic properties / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.25.Op – Mixed states, critical fields, and surface sheaths
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
