2002/03/29 by H. J. Kang, Pengcheng Dai, D. Mandrus +9
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.66.064506
4 pages and 3 figures
arxiv created 2002/03/29 · openalex publication_date 2002/08/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We use inelastic neutron scattering to study the evolution of the generalized phonon density of states (GDOS) of the n-type high-Tc superconductor Nd_2\ensuremath-xCexCuO_4+\ensuremathδ, from the half-filled Mott-insulator (x=0) to the Tc=24K superconductor (x=0.15). Upon doping the CuO2 planes in Nd2CuO_4+\ensuremathδ with electrons by Ce substitution, the most significant change in the GDOS is the softening of the highest phonon branches associated with the Cu-O bond stretching and out-of-plane oxygen vibration modes. However, most of the softening occurs within the first few percent of Ce doping, and is not related to the electron-doping-induced nonsuperconducting-superconducting transition at x\ensuremath≈0.12. These results suggest that the electron-lattice coupling in the n-type high-Tc superconductors is weaker than that in the p-type materials.