Oxidation state of mercury in HgBa{sub 2}(Ca{sub 0.86}Sr{sub 0.14}){sub 2}Cu{sub 3}O{sub 8+{delta}} studied by x-ray photoelectron spectroscopy

Journal Article · Sun Oct 01 00:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.R9879· OSTI ID:240384

Gopinath, C S ^[1]; Hur, N H ^[2]; Subramanian, S ^[1]

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1. Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Madras 600 036 (India)
2. Korea Research Institute of Standards and Science, Yusong, P.O. Box 102, Taejon 305-600 (Korea, Republic of)

Hg 4{ital f} core levels of HgBa{sub 2}(Ca{sub 0.86}Sr{sub 0.14}){sub 2}Cu{sub 3}O{sub 8+{delta}} (Hg-1223) and HgO were measured by x-ray photoelectron spectroscopy in order to demonstrate the oxidation state of mercury ions in the superconducting oxide. The binding energy of the Hg 4{ital f}{sub 7/2} level is found to be at 99.9 eV in HgO and 101.0 and 103.4 eV in Hg-1223. This result reveals that the oxidation state of Hg is definitely more than +2 and it exists in a mixed-valent state. The creation of charge carriers in Hg-1223 is discussed in terms of a charge transfer between Hg-O{sub {delta}} and Cu-O layers.

• OSTI ID: 240384
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
BINDING ENERGY
CALCIUM OXIDES
CHARGE CARRIERS
CUPRATES
ELECTRONIC STRUCTURE
F STATES
HIGH-TC SUPERCONDUCTORS
LATTICE PARAMETERS
MERCURY
MERCURY OXIDES
PHOTOELECTRON SPECTROSCOPY
PRESSURE DEPENDENCE
STRONTIUM OXIDES
TRANSITION TEMPERATURE
VALENCE