Structure and superconductivity in Cr-substituted HgBa{sub 2}CuO{sub 4+8}.
Chromium-substituted Hg{sub 1-x}Ba{sub 2}CuO{sub 4+{delta}} compounds have been synthesized. Cr can be incorporated into the structure with a solubility limit around x {approx} 0.27. Cr substitutes at the Hg site and is tetrahedrally coordinated to four oxygen atoms. Two of these are apical oxygen atoms that have moved to new positions (O2') and two are in the Hg/Cr plane (O3) at a (x x 0) site. Additional oxygen atoms (O4) in the Hg/Cr plane at (1/2 1/2 0) affect the carrier concentration, as for HgBa{sub 2}CuO{sub 4+{delta}}. In the as-synthesized samples, {Tc} decreases with increasing Cr content. Attempts to adjust the carrier concentration by post annealing in oxygen at low temperature destroy superconductivity because the samples are metastable under ambient conditions.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- ER
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937983
- Report Number(s):
- ANL/MSD/JA-25206
- Journal Information:
- Physica C, Journal Name: Physica C Journal Issue: May 15, 1997 Vol. 279; ISSN 0921-4534; ISSN PHYCE6
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Introduction of lanthanide on the mercury site of the HgBa{sub 2}CuO{sub 4} superconductor
Gas effusion spectra of HgBa{sub 2}CuO{sub 4+{delta}}