Data di Pubblicazione:
2011
Citazione:
Crystal structure and structural phase transitions in the GdBaCo2O5.0 cobaltite / L. Lo Presti, M. Allieta, M. Scavini, P. Ghigna, L. Loconte, V. Scagnoli, M. Brunelli. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:10(2011 Sep 07), pp. 104107.1-104107.9. [10.1103/PhysRevB.84.104107]
Abstract:
We present an accurate investigation of the prototypical rare-earth cobaltite GdBaCo2O5.0 by complementary
synchrotron powder and conventional source single-crystal x-ray diffraction experiments. The correct space
group (Pmmm) and the accurate crystallographic structure of this compound at room temperature (RT) have been
determined. By increasing T a second-order structural-phase transition to a tetragonal structure with space group
P4/mmm at T ≈ 331 K is found. Close to the N´eel temperature (TN ≈ 350 K), anomalies appear in the trend of
the lattice constants, suggesting that the structural phase transition is incipient at TN. A possible mechanism for
this complex behavior is suggested.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
L. Lo Presti, M. Allieta, M. Scavini, P. Ghigna, L. Loconte, V. Scagnoli, M. Brunelli
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