Thermoelectric power of HgBa{sub 2}CaCu{sub 2}O{sub 6+{delta}}, HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}, and (Hg,Tl)Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}
- Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)
- Midwest Superconductivity, Inc., 1321 Wakarusa Dr., Lawrence, Kansas 66049 (United States)
The temperature dependence of the newly discovered thermoelectric power of the high temperature superconductors HgBa{sub 2}CaCu{sub 2}O{sub 6+{delta}}, HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}, and (Hg,Tl)Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} are reported. The as-sintered HgBa{sub 2}CaCu{sub 2}O{sub 6+{delta}}, HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} materials appear under-doped with oxygen, resulting in a low hole concentration state and a high thermopower value. After the materials were annealed in O{sub 2}, the thermopower values decrease, indicating the increase in the concentration of charge carriers. When Hg is partially substituted with Tl, the as-sintered 1223 phase (Hg,Tl)Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} has a smaller thermopower than the undoped HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} material, confirming that Tl substitution for Hg increases the initial hole carrier concentration. It is clear that the oxygen content, and hence the carrier concentration has a significantly large influence on the thermoelectric power. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 172166
- Report Number(s):
- CONF-940830-; ISSN 0094-243X; TRN: 96:003256
- Journal Information:
- AIP Conference Proceedings, Vol. 316, Issue 1; Conference: 13. international conference on thermoelectrics, Kansas City, MO (United States), 30 Aug - 1 Sep 1994; Other Information: PBD: 10 Aug 1994
- Country of Publication:
- United States
- Language:
- English
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