Article

Softening of Bond Stretching Phonon Mode in Ba1−xKxBiO3 Superconductor

Department of Physics, Sharif University of Technology, P.O. Box 1165-9161, Tehran, Iran
Journal of Superconductivity and Novel Magnetism (impact factor: 0.65). 04/2012; 23(7):1385-1389. DOI:10.1007/s10948-010-0788-7 pp.1385-1389

ABSTRACT Single crystals of Ba1−x
K
x
BiO3 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.

KeywordsInelastic X-ray scattering-Superconductivity-Phonon softening

0 0
 · 
0 Bookmarks
 · 
46 Views
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

BiO3 compound
 
crystal structure
 
different values
 
electrochemical method
 
high-resolution inelastic X-ray scattering
 
higher energy
 
highest energy phonon
 
KeywordsInelastic X-ray scattering-Superconductivity-Phonon
 
Laue X-ray
 
low energy region
 
potassium concentration
 
powder X-ray diffraction
 
Single crystals
 
superconducting region
 
superconducting samples
 
superconductivity