Effects of chemical pressure on the Fermi surface and band dispersion of the electron-doped high-Tc superconductors
M. Ikeda, T. Yoshida, A. Fujimori, M. Kubota, K. Ono, Hena Das, T. Saha-Dasgupta, K. Unozawa, Y. Kaga, T. Sasagawa, H. Takagi
DOI 10.1103/PhysRevB.80.014510 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We have performed angle-resolved photoemission spectroscopy measurements and first-principles electronic-structure calculations on the electron-doped high-Tc superconductors (HTSCs) Ln1.85Ce0.15CuO4 (Ln=Nd, Sm, and Eu). The observed Fermi surface and band dispersion show such changes that with decreasing ionic size of Ln3+ (increasing chemical pressure), the curvature of the Fermi surface or −t′/t decreases, where t and t′ are transfer integrals between the nearest-neighbor and next-nearest-neighbor Cu sites, respectively, explaining the apparently inconsistent behavior seen in the hole-doped HTSC La2−xSrxCuO4 under epitaxial strain. Around the node, the antiferromagnetic gap is opened with increasing chemical pressure. We propose that the nodal gap opening is possibly due to the decrease in −t′/t through the improved nesting, leading to the decrease in Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Sm1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
| Eu1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 135 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | Pressure not reported | unknown |
Similar papers
Differences in the high-energy kink between hole- and electron-doped high-Tc superconductors
similarity 0.98M. Ikeda et al.
Source status unknown — claims are unverified
Enhancement of the Critical Temperature of HgBa2CuO4+δ by Applying Uniaxial and Hydrostatic Pressure: Implications for a Universal Trend in Cuprate Superconductors
similarity 0.96F. Hardy et al.
Source status unknown — claims are unverified
Synthesis, structure, and properties of the high-temperature superconductor HgBa2CuO4+δ
similarity 0.96J. P. Hodges et al.
Source status unknown — claims are unverified
Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd1.85Ce0.15CuO4: A Resonant Inelastic X-Ray Scattering Study
similarity 0.96K. Ishii et al.
Source status unknown — claims are unverified
Calculated magnetic exchange interactions in high-temperature superconductors
similarity 0.96Xiangang Wan et al.
Source status unknown — claims are unverified
Oxygen dependence of the crystal structure of HgBa2CuO4+δ and its relation to superconductivity
similarity 0.96Q. Huang et al.
Source status unknown — claims are unverified