Comment on “Tilting of the octahedra in as seen by Mössbauer spectroscopy”

Daniel Haskel, Edward A. Stern, Hanan Shechter

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6 Scopus citations


We discuss the different characteristic time scales of the x-ray absorption fine structure (XAFS), (Formula presented) and Mössbauer spectroscopy (MS), (Formula presented) techniques for structural determination at small-length scales. We show that XAFS and MS can measure different local atomic arrangements in (Formula presented) provided the local structural units are dynamical. Combined knowledge from these complementary techniques is used to determine that the local tilts of the (Formula presented) octahedra do not vanish with temperature but are dynamic, with the oxygen atoms at the apex positions [O(2)] hopping among local minima of the energy’s surface. Evidence is found for a crossover between different time domains in which the hopping time, (Formula presented) changes from (Formula presented) to (Formula presented) We conclude that the Mössbauer results [Phys. Rev. B 54, R800 (1996)], contrary to the authors’ conclusions, do not contradict our XAFS results [Phys. Rev. Lett. 76, 439 (1996)].

Original languageEnglish
Pages (from-to)8034-8035
Number of pages2
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - 1998
Externally publishedYes


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