Electrochemistry and staging in La{sub 2}CuO{sub 4+{delta}}
- Center for Material Science and Engineering and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Measurements are reported of the time dependence of the current during electrochemical oxidation and reduction at a fixed voltage of single crystals and ceramic samples of La{sub 2}CuO{sub 4+{delta}}. Staging peaks in neutron measurements of the single crystals together with the electrochemical measurements and magnetization measurements confirm that stage n=6 corresponds to {delta}=0.055{plus_minus}0.05, the high-{delta} side of the oxygen-rich{endash}oxygen-poor miscibility gap. Furthermore, stage n=4 occurs at a value of {delta} consistent with {delta}{proportional_to}n{sup {minus}1}. For ceramic samples it is shown that two different superconducting compounds are formed depending on the oxidation voltage used. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 614978
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase separation and oxygen diffusion in electrochemically oxidized La{sub 2}CuO{sub 4+{delta}}: A static magnetic susceptibility study
Evidence of in-plane superstructure formation in phase-separated and staged single crystal La{sub {bold 2}}CuO{sub {bold 4+{delta}}}