Qualitative picture of a new mechanism for high-Tc superconductors

Details Qualitative picture of a new mechanism for high-Tc superconductors Qualitative picture of a new mechanism for high-Tc superconductors

2003-05-19

arxiv.org/abs/cond-mat/0305452v1

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures, New3SC-4 Conference Proceedings, to be published in ijmpb

Scientific paper

10.1142/S0217979203020879

Xu et al. observed enhanced Nernst effect and Iguchi et al. observed patched diamagnetism, both well above $T_c$ in underdoped high-$T_c$ superconductors (HTSCs). A new mechanism is proposed here, which seems to naturally explain, at least qualitatively, these observations, as well as the d-wave nature and continuity of pseudogap and pairing gap, the tunneling conductance above $T_c$, as well as $T^*(x)$, $T_{\nu}(x)$, $T_c(x)$, etc. This mechanism combines features of dynamic charged stripes, preformed pairs, and spin-bags: At appropriete doping levels, the doped holes (and perhaps also electrons) will promote the formation of anti-phase islands in short-range anti-ferromagnetic order. On the boundary of each such island reside two doped carriers; the unscreened Coulomb repulsion between them stabilizes its size. Superconductivity results when such ``pre-formed pairs'' Bose-condense.

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