Abstract
Single crystals of Ba1−xKxBiO3 compound for different values of x (0≤x≤0.6) from insulator to superconducting region have been grown by electrochemical method. The crystals have been characterized by powder X-ray diffraction and Laue X-ray to determine the crystal structure, phases and potassium concentration. The phonon dispersion of the crystals in (100) direction has been investigated by high-resolution inelastic X-ray scattering. The phonon dispersion for low energy region is almost similar for all crystals measured in this study, while the higher energy modes shift to higher energy by increasing the potassium concentration. Anomalous softening of highest energy phonon has been observed across the insulator–superconductor transition around q∼0.25. Observation of the softening in the superconducting samples indicates a correlation between the softening and superconductivity in this system.
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