Structural properties and phase diagram of the La(Fe1-xRux)AsO system (Articolo in rivista)

Type
Label
  • Structural properties and phase diagram of the La(Fe1-xRux)AsO system (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Alternative label
  • A. Martinelli 1, A. Palenzona 1, I. Pallecchi 1, C. Ferdeghini 1, M. Putti 1,2, S. Sanna 3, C. Curfs 4, C. Ritter 5 (2013)
    Structural properties and phase diagram of the La(Fe1-xRux)AsO system
    in Journal of physics. Condensed matter (Print)
    (literal)
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  • A. Martinelli 1, A. Palenzona 1, I. Pallecchi 1, C. Ferdeghini 1, M. Putti 1,2, S. Sanna 3, C. Curfs 4, C. Ritter 5 (literal)
Pagina inizio
  • 395701 (literal)
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  • 25 (literal)
Rivista
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  • 1 SPIN-CNR, C.so Perrone 24, I-16152 Genova, Italy 2 Department of Physics, Universit`a di Genova, Via Dodecaneso 33, I-16146 Genova, Italy 3 Department of Physics 'A Volta', Universit`a di Pavia-CNISM, I-27100 Pavia, Italy 4 European Synchrotron Radiation Facility, 6 rue Jules Horowitz, F-38043 Grenoble, France 5 Institute Laue--Langevin, 6 rue Jules Horowitz, F-38042 Grenoble Cedex 9, France (literal)
Titolo
  • Structural properties and phase diagram of the La(Fe1-xRux)AsO system (literal)
Abstract
  • Structural refinement, lattice micro-strain and spontaneous strain analyses have been carried out on selected members of the La.Fe1?xRux/AsO system using high-resolution neutron and synchrotron powder diffraction data. The obtained results indicate that the character of the tetragonal to orthorhombic structural transition changes from first order for x D 0:10, possibly to tricritical for x D 0:20, up to second order for x D 0:30; for x ? 0:40 symmetry breaking is suppressed, even though a notable increase of the lattice micro-strain develops at low temperature. By combining structural findings with previous muon spin rotation data, a phase diagram of the La.Fe1?xRux/AsO system has been drawn. Long-range ordered magnetism occurs within the orthorhombic phase (x ? 0:30), whereas short-range magnetism appears to be confined within the lattice strained region of the tetragonal phase up to x < 0:60. Direct comparison between the magnetic and structural properties indicates that the magnetic transition is always associated with structural symmetry breaking, although confined to a local scale at high Ru contents. (literal)
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