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Pairing Mechanism and Charge Stripes in La$_{2-x}$Sr$_{x}$CuO$_{4}$: A Real Space Approach | | X. Q. Huang
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7 Jun 2006 | | Subject: | Strongly Correlated Electrons; Superconductivity | | Abstract: | We argue that superconductivity originates from the real electrons not the artificial holes, and the mechanism of superconductivity should be established on a picture of electrons. A real-space superconductivity pairing mechanism for high-T$_{c}$ cuprates is developed. It is found that two localized electrons, due to a strong quantum confinement effect, can be in pairing because of the electromagnetic interaction (mediated by photon). Based on the mechanism, the relationships between the superconductivity and the charge-stripe order are discussed. In La$_{2-x}$Sr$_{x}$CuO$_{4}$ (LSCO) with $1/18leq xleq 1/4,$ we show that the paired electrons can self-organize into the so-called Wigner crystal. Two kinds of quasi-one-dimensional metallic charge stripes, which would contribute to the mechanism of superconductivity in cuprate superconductors, are analytically determined. Furthermore, the physical original of the so-called magic doping fractions (at x=1/4, 1/8, 1/9, 1/16 and 1/18) of superconductivity is given. Finally, we present for LSCO an analytical phase diagram which is in satisfactory agreement with the observations from experiments. | | Source: | arXiv, cond-mat/0606177 | | Services: | Forum | Review | PDF | Favorites | |
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