Journal
PHYSICAL REVIEW B
Volume 68, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.68.220506
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We report site-selective oxygen isotope (O-16/O-18) effect (OIE) measurements on the in-plane penetration depth lambda(ab) in underdoped Y0.6Pr0.4Ba2Cu3O7-delta, using the muon-spin rotation 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 CuO2 planes (100% within error bar). The values of the corresponding relative isotope shifts were found to be DeltaT(c)/T-c=-3.7(4)% and Deltalambda(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.
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