Lattice Instability in High Temperature Superconducting Cuprates and FeAs Systems : Polarons Probed by EXAFS

Carrier-induced lattice distortion (signature of polaron) in oxypnictide superconductors is found by an instantaneous local probe, extended X-ray absorption fine structure (EXAFS). Polaron formation is detected as two distinct nearest neighbor distances (Fe-As), implying an incoherent local mode tha...

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Bibliographic Details
Published in:Advances in condensed matter physics 2010-01, Vol.2010 (2010), p.1-10
Main Authors: Oyanagi, H., Zhang, C. J.
Format: Article
Language:English
Subjects:
Experiments
Molecular beam epitaxy
Noise
Spectrum analysis
Thin films
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Summary:Carrier-induced lattice distortion (signature of polaron) in oxypnictide superconductors is found by an instantaneous local probe, extended X-ray absorption fine structure (EXAFS). Polaron formation is detected as two distinct nearest neighbor distances (Fe-As), implying an incoherent local mode that develops coherence at the critical temperature. Comparing the results with the unusual lattice response in cuprate superconductors, intimate correlation between evolution of local lattice mode and superconductivity is revealed. The results suggest that strong electron-lattice interaction is present as a common ingredient in the microscopic mechanism of superconducting transition. The effect of magnetic impurity atoms in cuprates further indicates that magnetic scattering becomes diluted as long as polaron formation is conserved. We argue that polaron coherence dominates electrical conduction and magnetic interaction in oxypnictide and cuprate superconductors.
ISSN:1687-8108
1687-8124
DOI:10.1155/2010/484578