caa a22 4500 445381647 CHVBK 20180317143019.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0903-9 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0903-9 Lattice Anomalies and HTSC in Pnictides and Cuprates Studied by XAS: Polaron Resonance as a Common Clue [Elektronische Daten] [H. Oyanagi, C. Zhang] Temperature-dependent local lattice structures of 1111-type ReFeAsO1−x Fx (Re=La, Sm) are studied by extended X-ray absorption fine structure (EXAFS) and compared with the results of impurity-doped La1.85Sr0.15CuO4. As electron carriers are introduced by doping with F ions, pnictgen coordination around Fe atom shows unusual local lattice response below T ∗, described as an anomalous temperature dependence of mean-squared relative displacement. The observed local lattice distortion (leading to two distinct bond lengths R 1 and R 2 where ΔR=R 1−R 2∼0.1Å) is a signature of localized polaron formation. The effect of magnetic impurities in La1.85Sr0.15CuO4 indicates (bond stretching-type) lattice distortion favours polaron resonance as a common prerequisite for high-temperature superconductivity. Springer Science+Business Media, LLC, 2010 Pnictide nationallicence High temperature super conductivity nationallicence EXAFS nationallicence Polaron nationallicence Cuprates nationallicence Oyanagi H. National Institute of Advanced Industrial Science and Technology, 305-8568, 1-1-1 Umezono, Tsukuba, Ibaraki, Japan aut Zhang C. National Institute of Advanced Industrial Science and Technology, 305-8568, 1-1-1 Umezono, Tsukuba, Ibaraki, Japan aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 89-95 1557-1939 24:1-2<89 2011 24 10948 https://doi.org/10.1007/s10948-010-0903-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0903-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oyanagi H. National Institute of Advanced Industrial Science and Technology, 305-8568, 1-1-1 Umezono, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Zhang C. National Institute of Advanced Industrial Science and Technology, 305-8568, 1-1-1 Umezono, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 89-95 1557-1939 24:1-2<89 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer