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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/1155

Title: d-Wave bipolaronic stripes and two energy scales in cuprates
Authors: Alexandrov, A.S.
Keywords: superconductivity
strongly correlated electrons
Issue Date: 2000
Abstract: There is strong experimental evidence for pairing of polaronic carriers in the normal state, two distinct energy scales, d-wave superconducting order parameter,and charge segregation in the form of stripes in several cuprates.All these remarkable phenomena might be unified in the framework of the bipolaron theory as a result of the formation of mobile bipolarons in the normal state and their Bose-Einstein condensation. Extending the BCS theory towards an intermediate and strong-coupling regime we show that there are two energy scales in this regime, a temperature independent incoherent gap and a temperature dependent coherent gap combining into one temperature dependent global gap. The temperature dependence of the gap and single particle (Giaver) tunnelling spectra in cuprates are quantitatively described. A framework for understanding of two distinct energy scales observed in Giaver tunnelling and Andreev reflection experiments is provided. We suggest that both d-wave superconducting order parameter and striped charge distribution result from the bipolaron (center-of-mass) energy band dispersion rather than from any particular interaction.
Description: This is a pre-print.
URI: https://dspace.lboro.ac.uk/2134/1155
Appears in Collections:Pre-Prints (Physics)

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