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The role of oxygen in quinternary superconductors.

Abstract

The oxygen composition of the new generation of high temperature superconductors (HTSC) has been found to play a crucial role in determining the superconductivity of these materials. However, measurement of the oxygen stoichiometry in such samples has proven difficult due to the small scattering cross section of oxygen, a light element, which has caused the oxygen scattering signal to be overwhelmed by the far larger signals generated off the heavier elements present in the HTSC samples. It is for this reason that previous ion beam analysis of oxide crystals has often either made no attempt to determine the oxygen content or has used O({alpha},{alpha})O resonances such as that at {approx} 3.05 MeV to probe the crystal. This work continues tests of a new technique for probing oxygen which overcomes the problem of an insignificant O BS signal by exploiting the large nuclear resonance found to occur in the O(p,p)O cross-section near an energy of 3.5 MeV in order to produce a significant oxygen edge in the H{sup +} BS spectrum obtained for the HTSC sample. The use of a H{sup +} beam is preferable to a He{sup 2+} beam for such work due to its enhanced sensitivity to light elements.  More>>
Authors:
Beckman, D R; Jamieson, D N [1] 
  1. Melbourne Univ., Parkville, VIC (Australia). School of Physics
Publication Date:
Dec 31, 1996
Product Type:
Miscellaneous
Report Number:
INIS-AU-0003; CONF-9511295-
Reference Number:
SCA: 665100; PA: AIX-28:058191; EDB-97:123119; SN: 97001842253
Resource Relation:
Conference: 9. Australian conference on nuclear technique of analysis, Newcastle (Australia), 27-29 Nov 1995; Other Information: PBD: [1996]; Related Information: Is Part Of 9th Australian conference on nuclear techniques of analysis. Proceedings; PB: 186 p.
Subject:
66 PHYSICS; SUPERCONDUCTING COMPOSITES; ION SCATTERING ANALYSIS; OXYGEN; BISMUTH OXIDES; CALCIUM OXIDES; CHANNELING; COPPER OXIDES; EXPERIMENTAL DATA; HYDROGEN IONS 1 PLUS; ION BEAMS; SENSITIVITY; STOICHIOMETRY; STRONTIUM OXIDES; STRUCTURAL CHEMICAL ANALYSIS
OSTI ID:
520660
Research Organizations:
Australian Inst. of Nuclear Science and Engineering, Lucas Heights, NSW (Australia)
Country of Origin:
Australia
Language:
English
Other Identifying Numbers:
Other: ON: DE97638268; TRN: AU9716177058191
Availability:
INIS; OSTI as DE97638268
Submitting Site:
AUN
Size:
pp. 107-109
Announcement Date:

Citation Formats

Beckman, D R, and Jamieson, D N. The role of oxygen in quinternary superconductors.. Australia: N. p., 1996. Web.
Beckman, D R, & Jamieson, D N. The role of oxygen in quinternary superconductors.. Australia.
Beckman, D R, and Jamieson, D N. 1996. "The role of oxygen in quinternary superconductors." Australia.
@misc{etde_520660,
title = {The role of oxygen in quinternary superconductors.}
author = {Beckman, D R, and Jamieson, D N}
abstractNote = {The oxygen composition of the new generation of high temperature superconductors (HTSC) has been found to play a crucial role in determining the superconductivity of these materials. However, measurement of the oxygen stoichiometry in such samples has proven difficult due to the small scattering cross section of oxygen, a light element, which has caused the oxygen scattering signal to be overwhelmed by the far larger signals generated off the heavier elements present in the HTSC samples. It is for this reason that previous ion beam analysis of oxide crystals has often either made no attempt to determine the oxygen content or has used O({alpha},{alpha})O resonances such as that at {approx} 3.05 MeV to probe the crystal. This work continues tests of a new technique for probing oxygen which overcomes the problem of an insignificant O BS signal by exploiting the large nuclear resonance found to occur in the O(p,p)O cross-section near an energy of 3.5 MeV in order to produce a significant oxygen edge in the H{sup +} BS spectrum obtained for the HTSC sample. The use of a H{sup +} beam is preferable to a He{sup 2+} beam for such work due to its enhanced sensitivity to light elements. The quinternary superconductor used for this investigation was a good quality pure Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} (BISCO, 2212) crystal. The size of this crystal was 5x5xl mm{sup 3} with the [001] face perpendicular to the surface. Measurements were performed using the University of Melbourne nuclear microprobe. The sample was mounted on an aluminium target holder using a carbon base adhesive which provided good electrical contact and it was oriented inside the target chamber by means of a four axis precision eucentric goniometer. 6 refs., 3 figs.}
place = {Australia}
year = {1996}
month = {Dec}
}