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

We report site-selective oxygen isotope ( $^{16}$ O/ $^{18}$ O) effect (OIE) measurements on the in-plane penetration depth $λ_{a b}$ in underdoped Y $_{0.6}$ Pr $_{0.4}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$ , using the muon-spin rotation ( $μ$ SR) technique. A pronounced OIE on the transition temperature $T_{c}$ as well as on $λ_{a b}^{- 2} (0)$ 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.

Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y $_{0.6}$ Pr $_{0.4}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y $_{0.6}$ Pr $_{0.4}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y0.60.6​Pr0.40.4​Ba22​Cu33​O7−δ7−δ​

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Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y0.60.6​Pr0.40.4​Ba22​Cu33​O7−δ7−δ​

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Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y $_{0.6}$ Pr $_{0.4}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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Site-selective oxygen isotope effect on the magnetic field penetration depth in underdoped Y $_{0.6}$ Pr $_{0.4}$ Ba $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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