Anomalous bond stretching phonons as a probe of charge fluctuations in perovskites
نویسندگان
چکیده
منابع مشابه
Charge dynamics of t-J model and anomalous bond-stretching phonons in cuprates
The density response of a doped Mott-Hubbard insulator is discussed starting from the t-J model in a slave boson 1/N representation. In leading order O(1) the density fluctuation spectra N(q,ω) are determined by an undamped collective mode at large momentum transfer, in striking disagreement with results obtained by exact diagonalization, which reveal a very broad dispersive peak, reminescent o...
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We explain the anomalous doping dependence of zone boundary (π, 0) and (π, π) bond-stretching phonons in La2−δSrδCuO4 in the range 0 < δ < 0.35. Our calculations are based on a theory for the density response of doped Mott-Hubbard insulators.
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ژورنال
عنوان ژورنال: Physica C: Superconductivity
سال: 2007
ISSN: 0921-4534
DOI: 10.1016/j.physc.2007.03.247