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

• Type: Article in International Scientific Journal
• Date: 2006

Authors

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

Journal

Title: Physical Review B - Condensed Matter and Materials Physics

Vol. 73

ISSN: 1098-0121

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 28 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4