Abstract
We consider high-temperature superconductors to be composed of molecular units that can undergo local charge fluctuations, alternating between quasi-free electrons (uncoupled to the lattice) and bipolaronic electron pairs (strongly coupled to local lattice deformations). On the basis of a generalized Boson-Fermion model, in which the internal degrees of freedom of the bosonic bipolarons are explicitly taken account, we show that the single-particle spectrum in the normal state displays a pseudogap together with a broad incoherent background arising from phonon shake-off effects, compatible with the features seen by ARPES. The behavior of pair distribution function, measuring the intracluster deformations, is characterized by a change-over from a single-peak to a double-peak structure as the temperature is increased, representing a hallmark of the lattice fluctuation origin of this incoherent background.
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Ranninger, J., Romano, A. (2002). Local Lattice Fluctuations and the Incoherent ARPES Background. In: Bianconi, A., Saini, N.L. (eds) Stripes and Related Phenomena. Selected Topics in Superconductivity, vol 8. Springer, Boston, MA. https://doi.org/10.1007/0-306-47100-0_29
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DOI: https://doi.org/10.1007/0-306-47100-0_29
Publisher Name: Springer, Boston, MA
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