2008/02/28 by John Mann, Mann, John, Pieder Beeli +4
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.0802.4110
4 pages, 4 Figures
arxiv created 2008/02/28 · openalex publication_date 2008/02/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have studied the oxygen-isotope effect on the superconducting transition temperature Tc in overdoped Y1-xCaxBa2Cu3O7-δ with x = 0.10, 0.20, and 0.25. We find the oxygen-isotope exponent αO to be small (∼0.02) for x = 0.10 but substantial (∼0.1) for x = 0.20 and 0.25. The doping level above which αO increases sharply coincides with a quantum critical point where the normal-state pseudogap starts to diminish. The present isotope-effect experiments provide direct and quantitative constraints on the pairing mechanism of high-temperature superconductivity in cuprates.