Percolative transition on ferromagnetic insulator manganites: Uncorrelated to correlated polaron clusters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Lopes, Anabela M L M L M L (Autor) Outra; Araújo, João Pedro (Autor) FCUP; Ramasco, José J. (Autor) Outra; Amaral, V. S. (Autor) Outra; Suryanarayanan, Ramanathaan (Autor) Outra; Correia, J. G. (Autor) Outra

Revista

Título: Physical Review B - Condensed Matter and Materials Physics

Vol. 73

ISSN: 1098-0121

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 29 Citações

Scopus - 28 Citações

Outras Informações

ID Authenticus: P-004-N4D

DOI: 10.1103/physrevb.73.100408

Abstract (EN): We report an atomic-scale study on the ferromagnetic insulator manganite LaMnO3.12 using gamma-gamma perturbed angular correlation spectroscopy. Data analysis reveals a nanoscopic transition from an undistorted to a Jahn-Teller (JT) distorted local environment upon cooling. The percolation thresholds of the two local environments enclose a macroscopic structural transition (rhombohedral-orthorhombic). Two distinct regimes of JT distortions were found: a high-temperature regime where uncorrelated polaron clusters with severe distortions of the Mn3+O6 octahedra survive up to T approximate to 800 K and a low-temperature regime where correlated regions have a weaker JT-distorted symmetry.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4