$\chem{O^-}$ dynamic Jahn-Teller polarons in $\chem{KTaO_3}$

Author： Maiwald M.   Schirmer O. F.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|64|6|776-782

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.64, Iss.6, 2010-03, pp. : 776-782

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

It is analyzed how dynamic Jahn-Teller coupling of an $\chem{O^-}$hole with the surrounding lattice in oxide perovskites affects theelectron paramagnetic resonance of shallow $\chem{O^-}$ defects.The predicted unusual resonance parameters are seen to berealized by experimentally identified $\chem{O^-}$ defects in$\chem{KTaO_3}$. These centers thus manifest the properties of dynamicJahn-Teller hole polarons in oxide perovskites. By varying thestrength of the Jahn-Teller coupling, a continuous transition tothe static Jahn-Teller case is modelled. The latter situationdescribes the properties of $\chem{O^-}$ polarons identifiedpreviously in other oxide perovskites.

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