Doping evolution of the phonon density of states and electron-lattice interaction in Nd${}_{2-x}$Ce${}_x$CuO${}_{4+\delta }$

Abstract

We use inelastic neutron scattering to study the evolution of the generalized phonon density of states (GDOS) of the $n$-type high-$T_c$ superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_{4+\delta }$ (NCCO), from the half-filled Mott-insulator ($x=0$) to the $T_c=24$ K superconductor ($x=0.15$). Upon doping the CuO${}_2$ planes in Nd${}_2$CuO${}_{4+\delta }$ (NCO) 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, the softening occurs within the first few percent of Ce-doping and is not related to the electron doping induced nonsuperconducting-superconducting transition (NST) at $x\approx 0.12$. These results suggest that the electron-lattice coupling in the $n$-type high-$T_c$ superconductors is different from that in the $p$-type materials.

4 pages and 3 figures

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Cited by in corpus (10)

• Progress and perspectives on the electron-doped cuprates
• Softening of Cu-O bond stretching phonon in tetragonal HgBa${}_2$CuO${}_{4+\delta }$
• An angle-resolved photoemission spectral function analysis of the electron doped cuprate Nd_1.85Ce_0.15CuO_4
• Isotope effect and bond-stretching phonon anomaly in high-Tc cuprates
• Phonon anomalies and dynamic stripes
• Dispersion of the high-energy phonon modes in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$
• Thermal Conductivity of Pr_{1.3-x}La_{0.7}Ce_xCuO_4 Single Crystals and Signatures of Stripes in an Electron-Doped Cuprate
• Giant electron-phonon anomaly in doped La2CuO4 and other cuprates
• Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La${}_{2-x}$Ce${}_x$CuO${}_{4\pm \delta }$
• Analysis of the spectral function of Nd1.85Ce0.15CuO4, obtained by angle resolved photoemission spectroscopy