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Title of Journal: J Mater Sci Mater Electron

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Abbravation: Journal of Materials Science: Materials in Electronics

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Springer US

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DOI

10.1016/0006-2952(85)90583-0

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1573-482X

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Influence of Ti doping on the superconducting prop

Authors: Nawazish A Khan Abdul Sammed Khan M Nasir Khan M Rahim Najmul Hassan
Publish Date: 2016/08/04
Volume: 27, Issue: 11, Pages: 12178-12184
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Abstract

YBa2Cu3−xTixO7−δ x = 0 01 02 03 04 05 superconductors are synthesized at 900 °C by solid state reaction method The superconducting properties of the samples are studied by Xray diffraction resistivity ACsusceptibility and Fourier transform infrared spectroscopy FTIR absorption measurements These samples have shown orthorhombic crystal structure and the cell parameters slightly increase for higher Ticontents The TcR = 0 the onset temperature and magnitude of diamagnetism are suppressed with increasing Tidoping A new inchain Ti–O–Cu1 oxygen vibration mode appears around 551 cm−1 in the FTIR spectra which grows in intensity with increased Tidoping The peak position of the CuO2 planar oxygen mode is not affected with the doping of Ti showing that Ti is doped at the inchaincopper Cu1 sites in the unit cell The fluctuation induced conductivity analyses reveals that despite an increase in the parameters such as ξc VF and interlayer coupling J the critical temperature and superconductor volume fraction are suppressed It shows that the doped Tiatoms most likely induce anharmonic oscillations which may suppress the density of phonon population and hence the superconductivity It can also be witnessed in the decreased phase relaxation time of the carriers with increasing Tidoping These studies stress on the essential role of soft phonons in the mechanism of high Tc superconductivity in YBa2Cu3−xTixO7−δ superconductors

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