Open AccessJournal Article
Evidence for Jahn-Teller polaron formation and spin-cluster-assisted variable-range-hopping conduction in La0.7Ca0.3MnO3
TLDR
The role of the JT polaron in determining the electronic and magnetic properties above T c is discussed in this paper, where phase transitions at T c (=245 K), 345 K and 545 K are discussed.Abstract:
Resistivity (15-710 K), magnetization (80-723 K), and calorimetric (200-623 K) measurements on La 0.7 Ca 0.3 MnO 3 have shown evidence for the formation of Jahn-Teller (JT) polarons below ∼545 K. Above 560 K, activated conduction with E a = 0.05 eV is observed and X -1 (T) shows Curie-Weiss behaviour. Over the temperature range 270-340 K, the conductivity follows Mott's VRH model and X -1 (T) provides evidence of the formation of spin clusters. Calorimetric study shows phase transitions at T c (=245 K), 345 K and 545 K. The role of the JT polaron in determining the electronic and magnetic properties above T c is discussed.read more
Citations
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Modelling colossal magnetoresistance manganites
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Temperature dependent evolution of the electronic and local atomic structure in the cubic colossal magnetoresistive manganite La1-xSrxMnO3
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Electron- and hole-doping effects on the electronic structure of manganite studied by x-ray absorption spectroscopy
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Non-adiabatic small polaron hopping in the n = 3 Ruddlesden–Popper compound Ca4Mn3O10
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References
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Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films.
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TL;DR: The samples show a drop in the resistivity at the magnetic transition, and the existence of magnetic polarons seems to dominate the electric transport in this region.
Journal ArticleDOI
Double exchange alone does not explain the resistivity of La1-xSrxMnO3.
TL;DR: It is proposed that in addition to double-exchange physics a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn $d$ level plays a crucial role.
Journal ArticleDOI
Low temperature magnetoresistance and the magnetic phase diagram of La1-xCaxMnO3.
TL;DR: An unexpectedly large magnetoresistance is seen at low temperatures in the FM phase, and is largely attributed to unusual domain wall scattering.