Precision neutron-diffraction study of the high-T{sub c} superconductor HgBa{sub 2}CuO{sub 4+{delta}}

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.3966· OSTI ID:450395

Aksenov, V L; Balagurov, A M; Sikolenko, V V; Simkin, V G ^[1]; Alyoshin, V A; Antipov, E V; Gippius, A A; Mikhailova, D A; Bouree, F ^[2]

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1. JINR, FLNP, 141980 Dubna (Russia)
2. LLB, 91191 Gif-sur-Yvette (France)

A neutron-diffraction study of HgBa{sub 2}CuO{sub 4+{delta}} structure and its dependence on extra oxygen content for {delta} between 0.06 and 0.19 has been carried out with four pure samples using high-resolution TOF and {lambda}=const diffractometers at room temperature and T=8 K. Sample characterization was done by measuring ac susceptibility, x-ray and EPR spectra, and by iodometric titration. A detailed analysis of atomic structure and the occupancy factors of mercury and oxygen was performed and showed the stoichiometric cation content. Extra oxygen was found only in the (1/2,1/2,0) position of the basal plane. T{sub c} varied parabolically with {delta} and exhibited a maximum of 98 K at {delta}{approx}0.12. The data obtained can be considered as evidence of the conventional anion doping mechanism with 2{delta} holes per CuO{sub 2} layer. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450395
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
BARIUM OXIDES
CHEMICAL COMPOSITION
COPPER OXIDES
ELECTRON SPIN RESONANCE
HIGH-TC SUPERCONDUCTORS
MAGNETIC SUSCEPTIBILITY
MERCURY OXIDES
NEUTRON DIFFRACTION
TIME-OF-FLIGHT METHOD
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY