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

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Label
  • The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0953-2048/21/9/092002 (literal)
Alternative label
  • Fratini M., Caivano R., Puri A., Ricci A., Ren Z.A., Dong X.L., Yang, J. Lu W., Zhao Z.X., Barba L., Arrighetti G., Polentarutti M., Bianconi A. (2008)
    The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs
    in Superconductor science and technology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Fratini M., Caivano R., Puri A., Ricci A., Ren Z.A., Dong X.L., Yang, J. Lu W., Zhao Z.X., Barba L., Arrighetti G., Polentarutti M., Bianconi A. (literal)
Pagina inizio
  • 092002 (literal)
Pagina fine
  • 092004 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 21 (literal)
Rivista
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • M.Fratini, R.Caivano, A.Puri, A.Ricci: UNI - Roma 1 Dip. Fisica Z.A.Ren, X.L.Dong, J.Yang, W.Lu, Z.X.Zhao: Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (literal)
Titolo
  • The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs (literal)
Abstract
  • We report the temperature dependent x-ray powder diffraction of the quaternary compound NdOFeAs (also called NdFeAsO) in the range between 300 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/n (or P2/c) space group, over a broad temperature range from 150 to 120 K, centered at T0 ~ 137 K. Therefore the temperature of this structural phase transition is strongly reduced, by about ~30 K, by increasing the internal chemical pressure going from LaOFeAs to NdOFeAs. In contrast, the superconducting critical temperature increases from 27 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. (literal)
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