Jahn-Teller Effect and Electron Correlation in Manganites
نویسندگان
چکیده
منابع مشابه
Jahn-Teller effect and Electron Correlation in manganites
Jahn-Teller (JT) effect both in the absence and presence of the strong Coulomb correlation is studied theoretically focusing on the reduction ∆K of the kinetic energy gain which is directly related to the spin wave stiffness. Without the Coulomb interaction, the perturbative analysis gives ∆K/(g2/MΩ2) ∼= 0.05− 0.13 depending on the electron number [g: electronphonon(el-ph) coupling constant, M ...
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We investigate the stability of the charge exchange (CE) phase within a microscopic model which describes a single plane as in La0.5Sr1.5MnO4. The model includes Coulomb interactions (on-site and intersite), the Jahn-Teller term and the superexchange interactions due to eg and t2g electrons. By investigating the phase diagram at T = 0 in mean-field approximation we conclude that the superexchan...
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The interplay between the electron repulsion U and the Jahn-Teller electronphonon interation ELR is studied with a large d model for the ferromagnetic state of the manganese oxides. These two interactions collaborate to induce the local isospin (orbital) moments and reduce the bandwidth B. Especially the retardation effect of the Jahn-Teller phonon with the frequency Ω is effective to reduce B,...
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Juan Salafranca,1,2 Rong Yu,3 and Elbio Dagotto1,2 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 32831, USA 3Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA Received 6 May 2010; revised manuscript received 26 May 2010; p...
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A minimal model, consisting of a 4 × 4 Hamiltonian and pertaining to a single Mn–O–Mn bond in the manganites, is introduced and solved to elucidate the physics of the dynamical Jahn–Teller effect on the double-exchange (DEX) interaction. The effect originates from the coupling of the motion of the bridging oxygen atom to the Mn electrons. It is shown that (i) the DEX interaction is considerably...
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ژورنال
عنوان ژورنال: ChemInform
سال: 2003
ISSN: 0931-7597,1522-2667
DOI: 10.1002/chin.200333239