Defects that control the properties of Tl- and Hg-based superconductors

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Defects that affect T{sub c} in Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} and HgBa{sub 2}CuO{sub 4+{delta}} and HgBa{sub 2}CuO{sub 4+{delta}} have been characterized by neutron powder diffraction. In Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}, the dominant defect is interstitial oxygen between the two Tl-O planes, but Cu substitution on the Tl site also affects properties and there is evidence for a second oxygen defect for compositions in the vicinity of maximum {Tc}. In HgBa{sub 2}CuO{sub 4+{delta}}, there are two competing oxygen defects in the Hg layer. The relative concentrations of these defects switches upon passing from the underdoped region, through the maximum {Tc}, to ... continued below

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7 p.

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Jorgensen, J.D.; Chmaissem, O.; Hinks, D.G.; Mitchell, J.F.; Wagner, J.L.; Jensen, W.R. et al. March 1, 1997.

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Defects that affect T{sub c} in Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}} and HgBa{sub 2}CuO{sub 4+{delta}} and HgBa{sub 2}CuO{sub 4+{delta}} have been characterized by neutron powder diffraction. In Tl{sub 2}Ba{sub 2}CuO{sub 6+{delta}}, the dominant defect is interstitial oxygen between the two Tl-O planes, but Cu substitution on the Tl site also affects properties and there is evidence for a second oxygen defect for compositions in the vicinity of maximum {Tc}. In HgBa{sub 2}CuO{sub 4+{delta}}, there are two competing oxygen defects in the Hg layer. The relative concentrations of these defects switches upon passing from the underdoped region, through the maximum {Tc}, to the overdoped region. This remarkable behavior could result from a change in the topology of the Fermi surface upon passing through the van Hove singularity.

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7 p.

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INIS; OSTI as DE97007017

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  • International conference on materials and mechanisms of superconductivity: high temperature superconductors, Beijing (China), 28 Feb - 4 Mar 1997

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  • Other: DE97007017
  • Report No.: ANL/MSD/CP--91983
  • Report No.: CONF-970235--8
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 510429
  • Archival Resource Key: ark:/67531/metadc691382

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  • March 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 23, 2016, 2:59 p.m.

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Jorgensen, J.D.; Chmaissem, O.; Hinks, D.G.; Mitchell, J.F.; Wagner, J.L.; Jensen, W.R. et al. Defects that control the properties of Tl- and Hg-based superconductors, article, March 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc691382/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.