Chemical potential jump between the hole-doped and electron-doped sides of ambipolar high-Tc cuprate superconductors
M. Ikeda, M. Takizawa, T. Yoshida, A. Fujimori, Kouji Segawa, Yoichi Ando
DOI 10.1103/PhysRevB.82.020503 · Physical Review B
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Abstract
In order to study an intrinsic chemical potential jump between the hole-doped and electron-doped high-Tc superconductors, we have performed core-level x-ray photoemission spectroscopy measurements of Y0.38La0.62Ba1.74La0.26Cu3Oy (YLBLCO), into which one can dope both holes and electrons with maintaining the same crystal structure. Unlike the case between the hole-doped system La2−xSrxCuO4 and the electron-doped system Nd2−xCexCuO4, we have estimated the true chemical potential jump between the hole-doped and electron-doped YLBLCO to be ∼0.8 eV, which is much smaller than the optical gaps of 1.4–1.7 eV reported for the parent insulating compounds. We attribute the reduced jump to the indirect nature of the charge-excitation gap as well as to the polaronic nature of the doped carriers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.38La0.62Ba1.74La0.26Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2Ca1-x(Pr,Eu)xCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NaxCa2-xCuO2Cl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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