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

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

2003-08-21

arxiv.org/abs/cond-mat/0308440v1

Phys. Rev. B, v. 68, 220506 (2003).

Physics

Condensed Matter

Superconductivity

4pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.220506

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 $\Delta\lambda^{-2}_{ab}(0)/\lambda^{-2}_{ab}(0)= -6.2(1.0)%$. Our results imply that in this compound the phonon modes involving the movement of planar oxygen are dominantly coupled to the electrons.

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