Magnetic properties of spin-diluted iron pnictides from mu SR and NMR in LaFe1-xRuxAsO (Articolo in rivista)

Type
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  • Magnetic properties of spin-diluted iron pnictides from mu SR and NMR in LaFe1-xRuxAsO (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.85.054518 (literal)
Alternative label
  • Pietro Bonf`a1, Pietro Carretta1, Samuele Sanna1, Gianrico Lamura2, Giacomo Prando1,3, Alberto Martinelli2, Andrea Palenzona2, Matteo Tropeano2, Marina Putti2 and Roberto De Renzi4 (2012)
    Magnetic properties of spin-diluted iron pnictides from mu SR and NMR in LaFe1-xRuxAsO
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Pietro Bonf`a1, Pietro Carretta1, Samuele Sanna1, Gianrico Lamura2, Giacomo Prando1,3, Alberto Martinelli2, Andrea Palenzona2, Matteo Tropeano2, Marina Putti2 and Roberto De Renzi4 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
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  • 6 (literal)
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  • 1 Department of Physics \"A. Volta\", University of Pavia-CNISM, I-27100 Pavia, Italy 2 CNR-SPIN and Universit`a di Genova, I-16146 Genova, Italy 3 Department of Physics \"E.Amaldi\", University of Roma Tre-CNISM, I-00146 Roma, Italy and 4 Department of Physics, University of Parma-CNISM, I-43124 Parma, Italy (literal)
Titolo
  • Magnetic properties of spin-diluted iron pnictides from mu SR and NMR in LaFe1-xRuxAsO (literal)
Abstract
  • The effect of isoelectronic substitutions on the microscopic properties of LaFe1-xRuxAsO, for 0< x< 0.8, has been investigated by means of muSR and 139La NMR. It was found that Ru substitution causes a progressive reduction of the N\`eel temperature (T_N) and of the magnetic order parameter without leading to the onset of superconductivity. The temperature dependence of 139La nuclear spin-lattice relaxation rate 1/T_1 can be suitably described within a two-band model. One band giving rise to the spin density wave ground-state, while the other one is characterized by weakly correlated electrons. Fe for Ru substitution yields to a progressive decrease of the density of states at the Fermi level close to the one derived from band structure calculations. The reduction of T_N with doping follows the predictions of the J_1-J_2 model on a square lattice, which appears to be an effective framework to describe the magnetic properties of the spin density wave ground-state. (literal)
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