The structural and superconducting properties of HgBa₂CuO_4+(delta ) have been investigated over a large doping range (0 < (delta) < 0.25). Two series of samples were measured in which oxygen contents were varied through different annealing conditions. Both series are found to have non-parabolic doping behavior as well as unusual structural phenomena in the underdoped region and at maximum T_c. Samples of identical oxygen content are found to have variations in T_c large as 30 K. These differences in superconducting and structural properties are evidence of oxygen/charge ordering present in HgBa₂CuO_4+(delta ). Results are discussed in terms of structural distortions present and possible charge ordering and the formation of filamentary condensates.

Date Published: 6 September 2000
PDF: 8 pages
Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397854

Published in SPIE Proceedings Vol. 4058:
Superconducting and Related Oxides: Physics and Nanoengineering IV
Davor Pavuna; Ivan Bozovic, Editor(s)