Physics of Nanosystems and NanotechnologyNo Access

COOPERATIVE LOCALIZATION-DELOCALIZATION IN THE HIGH T_c CUPRATES

JULIUS RANNINGER

Institut Néel, CNRS and Université Joseph Fourier, 25 rue des Martyrs, BP 166, 38042 Grenoble cedex 9, France

https://doi.org/10.1142/S0217979210057225Cited by:0 (Source: Crossref)

Abstract

The intrinsic metastable crystal structure of the cuprates results in local dynamical lattice instabilities, strongly coupled to the density fluctuations of the charge carriers. They acquire in this way simultaneously both, delocalized and localized features. It is responsible for a partial fractioning of the Fermi surface, i.e., the Fermi surface gets hidden in a region around the anti-nodal points, because of the opening of a pseudogap in the normal state, arising from a partial charge localization. The high energy localized single-particle features are a result of a segregation of the homogeneous crystal structure into checker-board local nano-size structures, which breaks the local translational and rotational symmetry. The pairing in such a system is dynamical rather than static, whereby charge carriers get momentarily trapped into pairs in a deformable dynamically fluctuating ligand environment. We conclude that the intrinsically heterogeneous structure of the cuprates must play an important role in this type of superconductivity.

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