Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-xCexCuO4

Matsui  H; Takahashi  T; Sato  TTerashima  KDing  HUefuji  TYamada  K

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Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-xCexCuO4

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The doping dependence of electronic states in an electron-doped high-temperature superconductor (HTSC) Nd2-xCexCuO4 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 (Delta(PG)) and the temperature (T-*) at which the pseudogap is filled-in show a close relation to the effective hyperfine coupling energy (J(eff)) and the spin-correlation length (xi(AF)), 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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《Physical review, B. Condensed matter and materials physics》 |2007年第22期|4514-1-4514-4-0|共4页
作者
Matsui H; Takahashi T; Sato TTerashima KDing HUefuji TYamada K;
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作者单位

Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan;

Japan Sci & Technol Agcy, JST, CREST, Kawaguchi 3320012, Japan;

Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USATohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
关键词
TRANSPORT-PROPERTIES; STATE; PR2-XCEXCUO4;

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Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2-xCexCuO4

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