Physics – Condensed Matter – Superconductivity
Scientific paper
2010-06-15
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
We have studied the novel isotope effects on the pairing pseudogap in underdoped and optimally doped cuprates within the large-polaron model and two non-standard BCS-like approaches. We have shown that in the intermediate-coupling regime the precursor pairing of large polarons occurs at a mean-field temperature $T^{\ast}>T_{c}$ and the near-absent, sizable and very large oxygen and copper isotope effects on $T^{\ast}$ exist in cuprates with small and large Fermi surfaces. Our results for $T^{\ast}$, isotope shifts and exponents in slightly underdoped and optimally doped cuprates are in quantitative agreement with existing experiments and explain the discrepancy between various experiments.
Djumanov Sh. S.
Dzhumanov S.
Ganiev O. K.
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