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25 April 2024 |
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Evidence for small or intermediate-size polarons in the ferromagnetic state of manganites | | Guo-meng Zhao
; D. J. Kang
; W. Prellier
; M. Rajeswari
; H. Keller
; T. Venkatesan
; R. L. Greene
; | | Date: |
2 Aug 2000 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 1and 2), D. J. Kang , W. Prellier , M. Rajeswari , H. Keller , T. Venkatesan , R. L. Greene ( University of Maryland, University of Zurich | | Abstract: | Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of La_{0.75}Ca_{0.25}MnO_{3} and Nd_{0.7}Sr_{0.3}MnO_{3}. We found that the residual resistivity
ho_{o} increases by about 15(3)% upon replacing ^{16}O by ^{18}O. This provides strong evidence for the presence of small or intermediate-size polarons in the metallic ferromagnetic state. Furthermore, the temperature dependent part of the resistivity at low temperatures consists of an AT^{4.5} term contributed from 2-magnon scattering, and a Bomega_{s}/sinh^{2}(hbaromega_{s}/2k_{B}T) term which arises from scattering by a soft optical phonon mode. The absolute magnitudes of the coefficient A and the phonon frequency hbaromega_{s} for both isotope samples are in quantitative agreement with theoretical predictions. | | Source: | arXiv, cond-mat/0008029 | | Services: | Forum | Review | PDF | Favorites | |
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