期刊
PHYSICAL REVIEW B
卷 82, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.020503
关键词
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资金
- KAKENHI [22740221, 19674002, 20030004, 20740196, 22740229]
- MEXT, Japan
- Grants-in-Aid for Scientific Research [22740221, 20740196, 20030004, 22740229] Funding Source: KAKEN
In order to study an intrinsic chemical potential jump between the hole-doped and electron-doped high-T-c 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 similar to 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.
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