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P Ganguly
Articles written in Pramana – Journal of Physics
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Volume 12 Issue 4 April 1979 pp 317-329 Solids
Transition metal oxide perovskites by photoelectron and x-ray absorption spectroscopy
W H Madhusudan Sheelavathi Kollali P R Sarode M S Hegde P Ganguly C N R Rao
X-ray and ultraviolet photoelectron spectroscopy as well as x-ray absorption spectroscopy have been employed to investigate transition metal oxide perovskites of the general formula ABO3 (A = La or rare-earth ion, B=trivalent transition metal ion). Systematics in the core levels and in the valence bands in the series of LaBO3 compounds have been discussed. Lanthanum chemical shifts in the x-ray absorption spectra in this series show interesting trends. Photoelectron spectra of the solid solutions, LaNi1−
x Cox O3, LaNi1−x Fex O3 and LaFe1−x Cox O3 show that the rigid band model is applicable to these systems. It is shown that x-ray photoelectron spectroscopy can be employed to identify multiple oxidation states of transition metal ions in oxide perovskites. -
Volume 28 Issue 2 February 1987 pp 1- Rapid Communication
P Ganguly A K Raychaudhuri K Sreedhar C N R Rao
Oxides of the Y-Ba-Cu-O system are found to show onset of superconductivity in the 100–120 K region.
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Volume 28 Issue 3 March 1987 pp 1- Rapid Communications
P Ganguly R A Mohan Ram K Sreedhar C N R Rao
The oxide responsible for high-temperature superconductivity (onset ∼100 K, zero resistance above liquid N2 temperature) is found to be YBa2Cu3O7±δ.
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Volume 28 Issue 5 May 1987 pp 605-605 Erratum
P Ganguly A K Raychaudhuri K Sreedhar C N R Rao R A Mohan Ram
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Volume 29 Issue 3 September 1987 pp 1- Rapid Communications
A K Ganguli L Ganapathi K Sreedhar R A Mohanram P Ganguly C N R Rao
Superconductivity is found in tetragonal La3−
x Ba3+x Cu6O14+δ and La, Ba)6−x Srx Cu6O14+δ even though they do not possess Cu-O chains or the K2NiF4 structure. Resistivity measurements confirm the occurrence of a transformation from chain-superconductivity to sheet-superconductivity in YBa2Cu3O7−δ as δ is varied in the range 0.0–0.5.
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Pramana – Journal of Physics
Volume 97, 2023
All articles
Continuous Article Publishing mode
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Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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