Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-08-06
Phys. Rev. B (Rapid Comm) 73, 100408(R) (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 Figures, submitted to PRL, new version with more data, text reformulated
Scientific paper
10.1103/PhysRevB.73.100408
In this work, we report an atomic scale study on the ferromagnetic insulator manganite LaMnO$_{3.12}$ using $\gamma-\gamma$ PAC spectroscopy. Data analysis reveals a nanoscopic transition from an undistorted to a Jahn-Teller-distorted local environment upon cooling. The percolation thresholds of the two local environments enclose a macroscopic structural transition (Rhombohedric-Orthorhombic). Two distinct regimes of JT-distortions were found: a high temperature regime where uncorrelated polaron clusters with severe distortions of the Mn$^{3+}$O$_{6}$ octahedra survive up to $T \approx 800 K$ and a low temperature regime where correlated regions have a weaker JT-distorted symmetry.
Amaral Vitor S.
Araujo J.-P.
Correia J. G.
Lopes A. M. L.
Ramasco Jose J.
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