Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y${}_{0.6}$Pr${}_{0.4}$Ba${}_2$Cu${}_3$O${}_{7-\delta }$

Abstract

We report site-selective oxygen isotope (${}^{16}$O/${}^{18}$O) effect (OIE) measurements on the in-plane penetration depth ${\lambda }_{ab}$ in underdoped Y${}_{0.6}$Pr${}_{0.4}$Ba${}_2$Cu${}_3$O${}_{7-\delta }$, using the muon-spin rotation ($\mu$SR) technique. A pronounced OIE on the transition temperature $T_c$ as well as on ${\lambda }_{ab}^{-2}(0)$ was observed, which mainly arises from the oxygen sites within the superconducting CuO${}_2$ planes (100 % within error bar). The values of the corresponding relative isotope shifts were found to be $T_c/T_c=-3.7(4)$ and $\Delta {\lambda }_{ab}^{-2}(0)/{\lambda }_{ab}^{-2}(0)=-6.2(1.0)$. Our results imply that in this compound the phonon modes involving the movement of planar oxygen are dominantly coupled to the electrons.

4pages, 4 figures

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Cited by in corpus (15)

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• Oxygen-isotope effect on the superconducting gap in the cuprate superconductor Y_{1-x}Pr_xBa_2Cu_3O_{7-δ}
• Absence of a boron isotope effect in the magnetic penetration depth of MgB${}_2$
• Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors
• Implications evinced by the phase diagram, anisotropy, magnetic penetration depths, isotope effects and conductivities of cuprate superconductors
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• Biordered superconductivity and strong pseudogap state
• Study of the in-plane magnetic penetration depth in the cuprate superconductor Ca_2-xNa_xCuO_2Cl_2: role of the apical sites
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• Isotope effect on the transition temperature $T_c$ in Fe-based superconductors: the current status