Site-selective oxygen isotope effect on the magnetic-field penetration depth in underdopedY0.6Pr0.4Ba2Cu3O7−δ

2003/08/21 by R. Khasanov, А. Shengelaya, A. Shengelaya +9 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.68.220506

published as Phys. Rev. B, v. 68, 220506 (2003). · 4pages, 4 figures

arxiv created 2003/08/21 · openalex publication_date 2003/12/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report site-selective oxygen isotope (¹⁶O/¹⁸O) effect (OIE) measurements on the in-plane penetration depth \ensuremathλ_ab in underdoped Y_0.6Pr_0.4Ba₂Cu₃O_7\ensuremath-\ensuremathδ, using the muon-spin rotation technique. A pronounced OIE on the transition temperature T_c as well as on \ensuremathλ_ab^\ensuremath-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 \ensuremathΔT_c/T_c=\ensuremath-3.7(4)% and \ensuremathΔ\ensuremathλ_ab^\ensuremath-2(0)/\ensuremathλ_ab^\ensuremath-2(0)=\ensuremath-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.

Citations

• The complex nature of superconductivity in MgB2 as revealed by the reduced total isotope effect
• Finite wave vector Jahn-Teller pairing and superconductivity in the cuprates

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