With main goal to study on the character of electron-phonon coupling we
measured the magnetic characteristics of single crystals of Ba_1-xK_xBiO₃
(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 T_c=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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