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The Raman, IR and force field have been investigated for A2Mn2O7 (A= Tl, In)by means of a short-range force constant model which includes four stretchingand four bending force constants. Unusual spectral and force field changes areobserved and analyzed. The stretching force constant Mn-O and A-O, are found tobe relatively higher than those of other pyrochlore oxides of the A2Mn2O7family, while the remaining force constant values are significantly smaller,especially for Tl2Mn2O7. This trend may be due to strong hybridization of theTl (6s) orbital with O (2p) and Mn (3d). The assignment of all the modes hasbeen proposed and potential energy distribution is also reported. The evaluatedfrequencies are close to the available observed infrared and Raman frequencies,giving further support to the present assignments.Comment: To be published in PRB, 17 page

physical review. b, condensed matter and materials physics

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Lattice dynamical study of optical modes inTl2Mn2O…