Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-x Cex Cu O4

H. Matsui; T. Takahashi; T. Sato; K. Terashima; H. Ding; T. Uefuji; K. Yamada

doi:10.1103/PhysRevB.75.224514

Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-x Cex Cu O4

H. Matsui, T. Takahashi, T. Sato, K. Terashima, H. Ding, T. Uefuji, K. Yamada

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article

70 Citations (Scopus)

Abstract

The doping dependence of electronic states in an electron-doped high-temperature superconductor (HTSC) Nd2-x Cex Cu O4 was studied by high-resolution angle-resolved photoemission spectroscopy. We observed that the high-energy pseudogap around the hot spot shows an abrupt filling-in at the magnet-superconductor phase boundary, resulting in the unusual reconstruction of the Fermi surface. The magnitude (ΔPG) and the temperature (T*) at which the pseudogap is filled-in show a close relation to the effective hyperfine coupling energy (Jeff) and the spin-correlation length (ξAF), respectively. These results suggest the magnetic origin of the pseudogap and the unconventional nature of the magnet-superconductor phase transition in electron-doped HTSC.

Original language	English
Article number	224514
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	75
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.75.224514
Publication status	Published - Jun 29 2007

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Matsui, H., Takahashi, T., Sato, T., Terashima, K., Ding, H., Uefuji, T., & Yamada, K. (2007). Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-x Cex Cu O4. Physical Review B - Condensed Matter and Materials Physics, 75(22), [224514]. https://doi.org/10.1103/PhysRevB.75.224514

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abstract = "The doping dependence of electronic states in an electron-doped high-temperature superconductor (HTSC) Nd2-x Cex Cu O4 was studied by high-resolution angle-resolved photoemission spectroscopy. We observed that the high-energy pseudogap around the hot spot shows an abrupt filling-in at the magnet-superconductor phase boundary, resulting in the unusual reconstruction of the Fermi surface. The magnitude (ΔPG) and the temperature (T*) at which the pseudogap is filled-in show a close relation to the effective hyperfine coupling energy (Jeff) and the spin-correlation length (ξAF), respectively. These results suggest the magnetic origin of the pseudogap and the unconventional nature of the magnet-superconductor phase transition in electron-doped HTSC.",

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AU - Matsui, H.

AU - Takahashi, T.

AU - Sato, T.

AU - Terashima, K.

AU - Ding, H.

AU - Uefuji, T.

AU - Yamada, K.

PY - 2007/6/29

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N2 - The doping dependence of electronic states in an electron-doped high-temperature superconductor (HTSC) Nd2-x Cex Cu O4 was studied by high-resolution angle-resolved photoemission spectroscopy. We observed that the high-energy pseudogap around the hot spot shows an abrupt filling-in at the magnet-superconductor phase boundary, resulting in the unusual reconstruction of the Fermi surface. The magnitude (ΔPG) and the temperature (T*) at which the pseudogap is filled-in show a close relation to the effective hyperfine coupling energy (Jeff) and the spin-correlation length (ξAF), respectively. These results suggest the magnetic origin of the pseudogap and the unconventional nature of the magnet-superconductor phase transition in electron-doped HTSC.

AB - The doping dependence of electronic states in an electron-doped high-temperature superconductor (HTSC) Nd2-x Cex Cu O4 was studied by high-resolution angle-resolved photoemission spectroscopy. We observed that the high-energy pseudogap around the hot spot shows an abrupt filling-in at the magnet-superconductor phase boundary, resulting in the unusual reconstruction of the Fermi surface. The magnitude (ΔPG) and the temperature (T*) at which the pseudogap is filled-in show a close relation to the effective hyperfine coupling energy (Jeff) and the spin-correlation length (ξAF), respectively. These results suggest the magnetic origin of the pseudogap and the unconventional nature of the magnet-superconductor phase transition in electron-doped HTSC.

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