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Thermopower and resistivity measurements on oxygen-annealed HgBa2CaCu2O6+δ

✍ Scribed by Y.T. Ren; J. Clayhold; F. Chen; Z.J. Huang; X.D. Qiu; Y.Y. Sun; R.L. Meng; Y.Y. Xue; C.W. Chu

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
296 KB
Volume
217
Category
Article
ISSN
0921-4534

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✦ Synopsis

We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa2CaCu2Oe+s (Hg-1212) as a function of temperature and oxygen annealing. Before annealina the Seebeck coefficient is moderate and positive, sugletting that the as-grown compound is slightly under-doped. After annealina ill oxygen at 200°C for 10 h, Tc was enhanced by 5 IC Further annealin 8 increased Tc by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resemblin 8 that of the Bi-based and TI-based systems. The carrier concentration was estimated from thermopower data and the T¢ value as ~ 0.13 and ~ 0.14 per Cu before and after oxygen annealing; respectively.

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