caa a22 4500 445380268 CHVBK 20180317143015.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10948-010-1110-4 doi (NATIONALLICENCE)springer-10.1007/s10948-010-1110-4 On the Structural Transition Driven by Band Nesting in1111Pnictides [Elektronische Daten] [Alessandro Ricci, Nicola Poccia, Boby Joseph, Antonio Bianconi] The lattice critical response in REFeAsO (RE=Pr, Nd and Sm) oxypnictides near the orthorhombic-to-tetrahedral structural phase transition is studied using ultra-high-resolution X-ray diffraction in the temperature range 4 to 250K. The critical exponent of the structural phase transition β is found to decrease with decreasing RE size. The β values determined to be 0.212, 0.209 and 0.194, respectively, for PrOFeAs, NdOFeAs and SmOFeAs. Temperature hysteresis is observed for all the REFeAsO, with ΔT being of the order of 2 to 3 K. The results are discussed in the frame of Fermi surface nesting induced structural transition in the pnictides. Springer Science+Business Media, LLC, 2010 High-temperature superconductivity nationallicence Pnictides nationallicence Structural phase transition nationallicence Powder diffraction nationallicence Ricci Alessandro Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut Poccia Nicola Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut Joseph Boby Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut Bianconi Antonio Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/3(2011-04-01), 1201-1205 1557-1939 24:3<1201 2011 24 10948 https://doi.org/10.1007/s10948-010-1110-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1110-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ricci Alessandro Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut NATIONALLICENCE 700 1- Poccia Nicola Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut NATIONALLICENCE 700 1- Joseph Boby Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut NATIONALLICENCE 700 1- Bianconi Antonio Department of Physics, Sapienza University of Rome, P. le A. Moro 2, 00185, Rome, Italy aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/3(2011-04-01), 1201-1205 1557-1939 24:3<1201 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer