X-RAY PHOTOELECTRON SPECTROSCOPIC STUDIES OF HGBA2CUO4+DELTA - MIXED-VALENT MERCURY AND COPPER

被引：11

作者：

GOPINATH, CS

SUBRAMANIAN, S

机构：

[1] Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Madras

来源：

PHYSICA C | 1994年 / 232卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90779-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have used X-ray photoelectron spectroscopy to investigate the oxidation states of Hg and Cu in HgBa2CuO4+delta. Contrary to the general expectations, we have observed three chemically different species of Hg. Two different types of Hg ions are in the 2+ oxidation state and the other species is present in an unusual oxidation state of 3+. Cu also shows the mixed-valent character (1+, 2+ and 3+) in this superconductor. Argon-annealed HgBa2CuO4+delta shows a decrease in Hg(III) content suggesting that Hg plays an important role in this superconductor. An internal redox mechanism is predicted in HgBa2CuO4+delta.

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页码：222 / 226

页数：5

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