Large oxygen-isotope shift above the quantum critical point of $Y_{1-x}Ca_xBa_2Cu_3O_{7-delta}$

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dc.creatorMann, John
dc.creatorBeeli, Pieder
dc.creatorZhao, Guo-meng
dc.date2008-02-28
dc.date.accessioned2026-07-07T09:23:43Z
dc.date.available2026-07-07T09:23:43Z
dc.descriptionWe have studied the oxygen-isotope effect on the superconducting transition temperature $T_{c}$ in overdoped Y$_{1-x}$Ca$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-δ}$ with $x$ = 0.10, 0.20, and 0.25. We find the oxygen-isotope exponent $α_{O}$ to be small ($\sim$0.02) for $x$ = 0.10 but substantial ($\sim$0.1) for $x$ = 0.20 and 0.25. The doping level above which $α_{O}$ 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.
dc.description4 pages, 4 Figures
dc.identifierhttps://arxiv.org/abs/0802.4110
dc.identifierhttp://arxiv.org/abs/0802.4110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155834
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleLarge oxygen-isotope shift above the quantum critical point of $Y_{1-x}Ca_xBa_2Cu_3O_{7-delta}$
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