Novel Isotope Effects on the Pairing Pseudogap in High-T_c Cuprates: Evidences for Polaronic Metal and Precursor BCS-Like Pairing of Large Polarons

2010/06/15 by S. Dzhumanov, Dzhumanov, S., O.K. Ganiev +3
Engineering · Materials Science · Physics and Astronomy · #F.2.2 #FOS: Physical sciences #Metallurgical Processes and Thermodynamics #Metallurgical and Alloy Processes #Physics of Superconductivity and Magnetism #Quantum Physics (quant-ph) #Superconductivity (cond-mat.supr-con) #ams.org

paper · pdf · doi:10.48550/arxiv.1006.2892

openalex publication_date 2010/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

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^∗>T_c and the near-absent, sizable and very large oxygen and copper isotope effects on T^∗ exist in cuprates with small and large Fermi surfaces. Our results for T^∗, 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.

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