Direct observation of the oxygen isotope effect on the in-plane magnetic field penetration depth in optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$

Abstract

We report the first direct observation of the oxygen-isotope (${}^{16}$O/${}^{18}$O) effect on the in-plane penetration depth ${\lambda }_{ab}$ in a nearly optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ film using the novel low-energy muon-spin rotation technique. Spin polarized low energy muons are implanted in the film at a known depth $z$ beneath the surface and precess in the local magnetic field $B(z)$. This feature allows us to measure directly the profile $B(z)$ of the magnetic field inside the superconducting film in the Meissner state and to make a model independent determination of ${\lambda }_{ab}$. A substantial isotope shift $\Delta {\lambda }_{ab}/{\lambda }_{ab}=2.8(7)$% at 4 K is observed, implying that the in-plane effective supercarrier mass $m_{ab}^{\ast }$ is oxygen-isotope dependent with $\Delta m_{ab}^{\ast }/m_{ab}^{\ast }=5.5(1.4)$.

4 pages, 2 figures

References in corpus (5)

• Oxygen isotope effect on the in-plane penetration depth in underdoped La_{2-x}Sr_{x}CuO_{4} single crystals
• Unconventional isotope effects in the high-temperature cuprate superconductors
• Isotope effect on $m^{\ast }$ in high-T_c materials due to the breakdown of Migdal's theorem
• Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors
• Oxygen-isotope effect on the in-plane penetration depth in underdoped Y_{1-x}Pr_xBa_2Cu_3O_{7-delta} as revealed by muon-spin rotation

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