Doping evolution of the phonon density of states and electron-lattice interaction in Nd2-xCexCuO 4+δ

H. J. Kang; Pengcheng Dai; D. Mandrus; R. Jin; H. A. Mook; D. T. Adroja; S. M. Bennington; S. H. Lee; J. W. Lynn

doi:10.1103/PhysRevB.66.064506

Doping evolution of the phonon density of states and electron-lattice interaction in Nd_2-xCe_xCuO _4+δ

H. J. Kang, Pengcheng Dai, D. Mandrus, R. Jin, H. A. Mook, D. T. Adroja, S. M. Bennington, S. H. Lee, J. W. Lynn

University of Tennessee, Knoxville

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

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-xCe_xCuO_4+δ, from the half-filled Mott-insulator (x=0) to the T_c=24 K superconductor (x=0.15). Upon doping the CuO₂ planes in Nd₂CuO_4+δ 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≈0.12. These results suggest that the electron-lattice coupling in the n-type high-T_c superconductors is weaker than that in the p-type materials.

Original language	English
Article number	064506
Pages (from-to)	645061-645065
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.66.064506
Publication status	Published - 1 Aug 2002
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.66.064506

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title = "Doping evolution of the phonon density of states and electron-lattice interaction in Nd2-xCexCuO 4+δ",

abstract = "We use inelastic neutron scattering to study the evolution of the generalized phonon density of states (GDOS) of the n-type high-Tc superconductor Nd2-xCexCuO4+δ, from the half-filled Mott-insulator (x=0) to the Tc=24 K superconductor (x=0.15). Upon doping the CuO2 planes in Nd2CuO4+δ 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≈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.",

author = "Kang, {H. J.} and Pengcheng Dai and D. Mandrus and R. Jin and Mook, {H. A.} and Adroja, {D. T.} and Bennington, {S. M.} and Lee, {S. H.} and Lynn, {J. W.}",

year = "2002",

month = aug,

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doi = "10.1103/PhysRevB.66.064506",

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T1 - Doping evolution of the phonon density of states and electron-lattice interaction in Nd2-xCexCuO 4+δ

AU - Kang, H. J.

AU - Dai, Pengcheng

AU - Mandrus, D.

AU - Jin, R.

AU - Mook, H. A.

AU - Adroja, D. T.

AU - Bennington, S. M.

AU - Lee, S. H.

AU - Lynn, J. W.

PY - 2002/8/1

Y1 - 2002/8/1

N2 - We use inelastic neutron scattering to study the evolution of the generalized phonon density of states (GDOS) of the n-type high-Tc superconductor Nd2-xCexCuO4+δ, from the half-filled Mott-insulator (x=0) to the Tc=24 K superconductor (x=0.15). Upon doping the CuO2 planes in Nd2CuO4+δ 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≈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.

AB - We use inelastic neutron scattering to study the evolution of the generalized phonon density of states (GDOS) of the n-type high-Tc superconductor Nd2-xCexCuO4+δ, from the half-filled Mott-insulator (x=0) to the Tc=24 K superconductor (x=0.15). Upon doping the CuO2 planes in Nd2CuO4+δ 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≈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.

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JO - Physical Review B - Condensed Matter and Materials Physics

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IS - 6

M1 - 064506

ER -

Doping evolution of the phonon density of states and electron-lattice interaction in Nd_2-xCe_xCuO _4+δ

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