Normal-state and superconducting properties of Ba1-xKxBiO3 single crystals

Valentina I. Gatalskaya 1,2Sergej V. Shiryaev 1,2Sergej N. Barilo 1Marek Baran 2Rita Szymczak 2Henryk Szymczak 2

1. The Institute of Solid State & Semiconductor Physics, Belarus NAS (ISSSP), P. Brovka, Minsk 220072, Belarus
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

With main goal to study on the character of electron-phonon coupling we
measured the magnetic characteristics of single crystals of Ba1-xKxBiO3
(x=0.34-0.49) for wide temperature range of 4.2K-300K at magnetic fields up
to 5T using SQUID magnetometer. The single crystals grown by electrochemical
deposition method with the typical size of 2x2x1mm3 reveal the
superconductivity at Tc=26K-31K depending on composition x. The X-ray
analysis displays the single-phase structure of the crystals. The volume
superconducting fraction of the samples equals to 0.8-0.9. The
susceptibility of crystals in the normal state (T=40K-300K) in different
fields was studied in order to estimate the density of state N(0) through
the term connected with the Pauli paramagnetism. These values of N(0) were
compared with the ones obtained from the temperature coefficient of the
upper critical field for all crystals. The obtained values of the coupling
constants are indicate of moderate-to-strong coupling.

 

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Presentation: poster at E-MRS Fall Meeting 2004, Symposium E, by Valentina I. Gatalskaya
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-28 09:59
Revised:   2009-06-08 12:55