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Direct observation of ultra--slow uncorrelated polaron dynamics in LaMnO$_{3+delta}$ | | A.M.L. Lopes
; J.P. Araujo
; J.J. Ramasco
; E. Rita
; V.S. Amaral
; J.G. Correia
; R. Suryanarayanan
; the ISOLDE Collaboration
; | | Date: |
6 Aug 2004 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | This letter reports a real-lattice atomic scale study on the LaMnO$_{3.12}$ compound using $gamma-gamma$ PAC spectroscopy. A thorough analysis of the PAC spectra revealed a continuous phase transition with two distinct local symmetries coexisting in a broad range of temperatures. The order-parameter $eta$ exponent hints for the free percolative nature of this transition, with the percolation thresholds delimiting the narrow range of temperatures where the average lattice symmetry presents Rhombohedric/Orthorhombic phase coexistence. The dynamics of the distorted local phase was studied via EFG fluctuations evidencing an ultra-slow thermal activated motion with an activation energy $E_a approx 0.31 eV$, close to the Jahn--Teller small polaron binding energy. The free percolative nature of the transition suggests the uncorrelated dynamics of lattice distortions compatible with the presence of a polaron gas. | | Source: | arXiv, cond-mat/0408150 | | Services: | Forum | Review | PDF | Favorites | |
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