2004/04/23 by R. Khasanov, А. Shengelaya, A. Shengelaya +5 · 1 citation
Engineering · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-8984/16/40/003
published as J. Phys.: Cond. Matt., v.16, S4439 (2004). · 22 pages, 12 figures. To be published in a special issue of J. Phys. Cond. Mat
arxiv created 2004/04/23 · openalex publication_date 2004/09/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Muon spin rotation (<em>μ</em>SR) studies of the oxygen isotope (<sup>16</sup>O/<sup>18</sup>O) effect (OIE) on the in-plane magnetic field penetration depth λ<sub><em>ab</em></sub> in cuprate high-temperature superconductors (HTS) are presented. First, the doping dependence of the OIE on the transition temperature <em>T</em><sub>c</sub> in various HTS is briefly discussed. It is observed that different cuprate families show similar doping dependences of the OIE on <em>T</em><sub>c</sub>. Then, bulk <em>μ</em>SR, low-energy <em>μ</em>SR, and magnetization studies of the total and site-selective OIE on λ<sub><em>ab</em></sub> are described in some detail. A substantial OIE on λ<sub><em>ab</em></sub> was observed in various cuprate families at all doping levels, suggesting that cuprate HTS are non-adiabatic superconductors. The experiments clearly demonstrate that the total OIE on <em>T</em><sub>c</sub> and λ<sub><em>ab</em></sub> arise from the oxygen sites within the superconducting CuO<sub>2</sub> planes, demonstrating that the phonon modes involving the movement of planar oxygen are dominantly coupled to the supercarriers. Finally, it is shown that the OIE on <em>T</em><sub>c</sub> and λ<sub><em>ab</em></sub> exhibit a relation that appears to be generic for different families of cuprate HTS. The observation of these unusual isotope effects implies that lattice effects play an essential role in cuprate HTS and have to be considered in any realistic model of high-temperature superconductivity.