The phase diagram of Sr_(1-x)Eu_xTiO_3: Crossover from displacive to order-disorder dynamics

Details The phase diagram of Sr_(1-x)Eu_xTiO_3: Crossover from displacive to order-disorder dynamics The phase diagram of Sr_(1-x)Eu_xTiO_3: Crossover from displacive to order-disorder dynamics

2011-10-13

arxiv.org/abs/1110.2922v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

The phase diagram of Sr_(1-x)Eu_xTiO_3 is determined experimentally by EPR measurements and analyzed theoretically in terms of the self-consistent phonon approximation (SPA) as a function of x (x=0.0, 0.03, 0.25, 0.5. 0.75, 1.0). It is observed that the oxygen octahedral tilting instability temperature T_S increases nonlinearly with x. The theoretical analysis demonstrates that a crossover from displacive to order-disorder dynamics takes place for x > 0.25, signaled by a change in the local double-well potential and the soft mode temperature dependence.

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