✦ LIBER ✦

X-ray photoelectron spectroscopic studies of HgBa2CuO4+δ. Mixed valent mercury and copper

✍ Scribed by C.S. Gopinath; S. Subramanian

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 366 KB
Volume: 232
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)90779-x

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✦ Synopsis

We have used X-ray photoelectron spectroscopy to investigate the oxidation states of Hg and Cu in HgBa2CuO4+6. 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 + ~ 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+6.

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