Electron Localization in Mixed-Valence Manganites
نویسندگان
چکیده
منابع مشابه
Magnetic localization in mixed-valence manganites
The metal-insulator transition is mixed-valence manganites of the ~La0.7Ca0.3!MnO3 type is ascribed to a modification of the spin-dependent potential JHs–S associated with the onset of magnetic order at TC . Here JH is the on-site Hund’s-rule exchange coupling of an eg electron with s51/2 to the t2g ion core with S 53/2. Above TC, the eg electrons are localized by the random spin-dependent pote...
متن کاملOn the correlation between the X-ray absorption chemical shift and the formal valence state in mixed-valence manganites.
Here the correlation between the chemical shift in X-ray absorption spectroscopy, the geometrical structure and the formal valence state of the Mn atom in mixed-valence manganites are discussed. It is shown that this empirical correlation can be reliably used to determine the formal valence of Mn, using either X-ray absorption spectroscopy or resonant X-ray scattering techniques. The difficulti...
متن کاملThe crucial role of mixed valence in the magnetoresistance properties of manganites and cobaltites.
The mixed valence Mn3+/Mn4+ and Co3+/Co4+ in manganites and cobaltites with the perovskite structure is absolutely necessary for the appearance of magnetotransport properties. It is shown that in these systems the Jahn Teller effect of the transition element, the charge and orbital ordering and the oxygen stoichiometry play a key role in the appearance of large and even colossal magnetoresistan...
متن کاملAn adiabatic picture for electron transfer in mixed-valence systems
An adiabatic picture is proposed to analyze short-time electronic coherence and dephasing in mixed-valence systems, which cannot be described by the Redfield equation or the golden-rule rate theory. In this picture, electronic coherence arises from Rabi oscillations between two adiabatic surfaces and decays as a result of inhomogeneous distributions and thermal fluctuations of Rabi frequencies....
متن کاملElectric-field-driven electron-transfer in mixed-valence molecules.
Molecular quantum-dot cellular automata is a computing paradigm in which digital information is encoded by the charge configuration of a mixed-valence molecule. General-purpose computing can be achieved by arranging these compounds on a substrate and exploiting intermolecular Coulombic coupling. The operation of such a device relies on nonequilibrium electron transfer (ET), whereby the time-var...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1995
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.75.3910