2002/02/08 by In-Sang Yang, In‐Sang Yang, Yang, In-Sang +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0202134
4 pages, 4 figures
arxiv created 2002/02/08 · openalex publication_date 2002/02/08 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In a prior study of the boron isotope effect on the transition temperature (Tc) of RNi2B2C (R = Y, Lu) system, a positive isotope effect was observed, e.g., Tc(10B)> Tc(11B). BCS theory predicts that the superconducting gap at zero temperature (Δ0) is proportional to Tc. Therefore, the gap should also show a positive boron isotope effect. On the contrary, in an inelastic light scattering study, we report a negative boron isotope effect on the energy Ω of the gap-like feature in B2g symmetry, e.g., Ω(10B)< Ω(11B). The origin of the effect is discussed in terms of selective probing of a non-conventional electron-phonon interaction on part of the Fermi surface, probably near the X point in the Brillouin zone.