Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e(g) system LaMn7O12 (Articolo in rivista)

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  • Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e(g) system LaMn7O12 (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.81.214412 (literal)
Alternative label
  • Cabassi R. a; Bolzoni F. a; Gilioli E. a; Bissoli F. a ; Prodi A. a; Gauzzi A. bc (2010)
    Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e(g) system LaMn7O12
    in Physical review. B, Condensed matter and materials physics (Online); American Physical Society (APS), College Pk (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cabassi R. a; Bolzoni F. a; Gilioli E. a; Bissoli F. a ; Prodi A. a; Gauzzi A. bc (literal)
Pagina inizio
  • 214412-1 (literal)
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  • 81 (literal)
Rivista
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  • In: Physical Review B, vol. 81 (21) article n. 214412. The American Physical Society, 2010. (literal)
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  • 5 (literal)
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  • 21 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • a CNR-IMEM, Parma; Italy b Institut de Mineralogie et de Physique des Milieux Condense, Universite Pierre et Marie Curie-Paris 6, France; c CNRS, 75005 Paris, France (literal)
Titolo
  • Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e(g) system LaMn7O12 (literal)
Abstract
  • We investigate the high-temperature magnetic and transport properties of LaMn7O12, which displays a similar perovskitelike structure and the same single-valent Mn3+ properties of LaMnO3 but a much simpler Jahn-Teller (JT) distortion at T_JT=650 K. We find that the magnetic response of LaMn7O12 is similar to that of LaMnO3 below T_JT, but strikingly different in the undistorted phase above T_JT, where the Curie-Weiss susceptibility is strongly suppressed. Electrical resistivity and thermopower measurements unveil a concomitant crossover from non-adiabatic to adiabatic small polaron regime. This suggests that the above suppression is due to low-spin electron-hole dimers formed by the e_g charge transfer between Mn sites and stabilized by the slow JT dynamics above T_JT. (literal)
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