Altered Sr environment

D. Haskel, E. Stern, D. Hinks, A. Mitchell, J. Jorgensen

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The atomic arrangement about the Sr atoms in (Formula presented) was investigated by Sr (Formula presented)-edge polarized x-ray-absorption fine structure on oriented powder with (Formula presented)=0.075 and 0.1 at (Formula presented) K. Our results confirm that Sr resides at the La lattice site but we discovered it induces major structural distortions in neighboring oxygen atoms. In particular, our best fits indicate that the O(2) apical oxygen to Sr is split into two sites separated by 0.30(4) Å, providing evidence for a strong lattice-hole interaction, i.e., a polaron, which may be involved in the pairing mechanism of these cuprates.

Original languageEnglish
Pages (from-to)R521-R524
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
StatePublished - 1997
Externally publishedYes


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