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

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

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Article number224514
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number22
DOIs
Publication statusPublished - Jun 29 2007
Externally publishedYes

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High temperature superconductors
Phase boundaries
high temperature superconductors
Superconducting materials
Magnets
magnets
Fermi surface
Electrons
Electronic states
Photoelectron spectroscopy
Fermi surfaces
electrons
photoelectric emission
Phase transitions
Doping (additives)
energy
high resolution
electronics
spectroscopy
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-x Cex Cu O4. / Matsui, H.; Takahashi, T.; Sato, T.; Terashima, Kensei; Ding, H.; Uefuji, T.; Yamada, K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 75, No. 22, 224514, 29.06.2007.

Research output: Contribution to journalArticle

Matsui, H. ; Takahashi, T. ; Sato, T. ; Terashima, Kensei ; Ding, H. ; Uefuji, T. ; Yamada, K. / Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-x Cex Cu O4. In: Physical Review B - Condensed Matter and Materials Physics. 2007 ; Vol. 75, No. 22.
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