Publication No.63



A. Stashans, H. Pinto, P. Sánchez. Superconductivity and 
Jahn-Teller polarons in titanates - J. Low Temp. Phys., 2003, 
Vol. 130, p. 415.

Abstract:
	The present work focuses on the superconductivity phenomenon 
in La-doped SrTiO3 crystal, and the Jahn-Teller (JT) polarons in 
BaTiO3 crystal. In the case of SrTiO3 crystal this study shows the 
occurrence of free electrons in the conduction band of the crystal 
and explains a number of the experimental results obtained for the 
superconducting La-doped SrTiO3 existing under 0.3 K. Free electrons 
are found to be situated within the Ti-O planes similar as in the 
case of the high temperature superconducting (HTS) cuprates. Results 
obtained for the JT polarons in BaTiO3 crystal explain a number of 
experimental observations and coincide with the other results obtained 
independently by the polaron theory. A phenomenological model 
explaining a bipolaron formation in titanates is suggested and analysed 
in the present work. 

PACS: 74.20.-z; 74.62.Dh; 74.90.+n.




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