Evolution of the pseudogap across the magnet-superconductor phase boundary of Nd2−xCexCuO4
H. Matsui, T. Takahashi, T. Sato, K. Terashima, H. Ding, T. Uefuji, K. Yamada
DOI 10.1103/PhysRevB.75.224514 · Physical Review B
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Abstract
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 (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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure unresolved | onset |
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