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.
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]
Crystal structure and structural phase transitions in the GdBaCo2O5.0 cobaltite
L. Lo PrestiPrimo
;M. AllietaSecondo
;M. Scavini;L. Loconte;
2011
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.File | Dimensione | Formato | |
---|---|---|---|
PhysRevB.84.pdf
accesso aperto
Tipologia:
Publisher's version/PDF
Dimensione
441.09 kB
Formato
Adobe PDF
|
441.09 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.