The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs

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dc.creatorFratini, Michela
dc.creatorCaivano, Rocchina
dc.creatorPuri, Alessandro
dc.creatorRicci, Alessandro
dc.creatorRen, Zhi-An
dc.creatorDong, Xiao-Li
dc.creatorYang, Jie
dc.creatorLu, Wei
dc.creatorZhao, Zhong-Xian
dc.creatorBarba, Luisa
dc.creatorArrighetti, Gianmichele
dc.creatorPolentarutti, Maurizio
dc.creatorBianconi, Antonio
dc.date2008-05-26
dc.date2008-08-11
dc.date.accessioned2026-07-07T09:55:36Z
dc.date.available2026-07-07T09:55:36Z
dc.descriptionWe report the temperature dependent x-ray powder diffraction of the quaternary compound NdOFeAs (also called NdFeAsO) in the range between 300 K and 95 K. We have detected the structural phase transition from the tetragonal phase, with P4/nmm space group, to the orthorhombic or monoclinic phase, with Cmma or P112/a1 (or P2/c) space group, over a broad temperature range from 150 K to 120 K, centered at T0 ~137 K. Therefore the temperature of this structural phase transition is strongly reduced, by about ~30K, by increasing the internal chemical pressure going from LaOFeAs to NdOFeAs. In contrast the superconducting critical temperature increases from 27 K to 51 K going from LaOFeAs to NdOFeAs doped samples. This result shows that the normal striped orthorhombic Cmma phase competes with the superconducting tetragonal phase. Therefore by controlling the internal chemical pressure in new materials it should be possible to push toward zero the critical temperature T0 of the structural phase transition, giving the striped phase, in order to get superconductors with higher Tc.
dc.description9 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0805.3992
dc.identifierhttp://arxiv.org/abs/0805.3992
dc.identifierFratini M et al Supercond. Sci. Technol. 21 (2008) 092002
dc.identifierdoi:10.1088/0953-2048/21/9/092002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166682
dc.subjectSuperconductivity
dc.titleThe effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs
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