Thermopower and resistivity measurements on oxygen-annealed HgBa2CaCu2O6+δ

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

doi:10.1016/0921-4534(93)90787-Q

Thermopower and resistivity measurements on oxygen-annealed HgBa₂CaCu₂O_6+δ

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

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Abstract

We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa₂CaCu₂O_6+δ (Hg-1212) as a function of temperature and oxygen annealing. Before annealing the Seebeck coefficient is moderate and positive, suggesting that the as-grown compound is slightly under-doped. After annealing in oxygen at 200°C for 10 h, T_c was enhanced by 5 K. Further annealing increased T_c by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resembling that of the Bi-based and Tl-based systems. The carrier concentration was estimated from thermopower data and the T_c value as ∼0.13 and ∼0.14 per Cu before and after oxygen annealing, respectively.

Original language	English
Pages (from-to)	6-10
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	217
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(93)90787-Q
Publication status	Published - 1993 Nov 10

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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@article{311602e24dee453a8857ba1ead5d51d5,

title = "Thermopower and resistivity measurements on oxygen-annealed HgBa2CaCu2O6+δ",

abstract = "We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa2CaCu2O6+δ (Hg-1212) as a function of temperature and oxygen annealing. Before annealing the Seebeck coefficient is moderate and positive, suggesting that the as-grown compound is slightly under-doped. After annealing in oxygen at 200°C for 10 h, Tc was enhanced by 5 K. Further annealing increased Tc by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resembling that of the Bi-based and Tl-based systems. The carrier concentration was estimated from thermopower data and the Tc value as ∼0.13 and ∼0.14 per Cu before and after oxygen annealing, respectively.",

author = "Ren, {Y. T.} and J. Clayhold and F. Chen and Huang, {Z. J.} and Qiu, {X. D.} and Sun, {Y. Y.} and Meng, {R. L.} and Xue, {Y. Y.} and Chu, {C. W.}",

note = "Funding Information: This work is supportedin part by USAFOSR F49620-93-1-031N0S, F GrantN o. DMR 91-22043, DARPA Grant No. MDA 972-88-G-002t,h e Texas Center for Superconductiviatyt the Universityo f Houston,a ndthe T.L.L. TempleF oundation.",

year = "1993",

month = nov,

day = "10",

doi = "10.1016/0921-4534(93)90787-Q",

language = "English",

volume = "217",

pages = "6--10",

journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Thermopower and resistivity measurements on oxygen-annealed HgBa2CaCu2O6+δ

AU - Ren, Y. T.

AU - Clayhold, J.

AU - Chen, F.

AU - Huang, Z. J.

AU - Qiu, X. D.

AU - Sun, Y. Y.

AU - Meng, R. L.

AU - Xue, Y. Y.

AU - Chu, C. W.

N1 - Funding Information: This work is supportedin part by USAFOSR F49620-93-1-031N0S, F GrantN o. DMR 91-22043, DARPA Grant No. MDA 972-88-G-002t,h e Texas Center for Superconductiviatyt the Universityo f Houston,a ndthe T.L.L. TempleF oundation.

PY - 1993/11/10

Y1 - 1993/11/10

N2 - We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa2CaCu2O6+δ (Hg-1212) as a function of temperature and oxygen annealing. Before annealing the Seebeck coefficient is moderate and positive, suggesting that the as-grown compound is slightly under-doped. After annealing in oxygen at 200°C for 10 h, Tc was enhanced by 5 K. Further annealing increased Tc by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resembling that of the Bi-based and Tl-based systems. The carrier concentration was estimated from thermopower data and the Tc value as ∼0.13 and ∼0.14 per Cu before and after oxygen annealing, respectively.

AB - We have measured the thermoelectric power and resistivity of the 120 K superconductor HgBa2CaCu2O6+δ (Hg-1212) as a function of temperature and oxygen annealing. Before annealing the Seebeck coefficient is moderate and positive, suggesting that the as-grown compound is slightly under-doped. After annealing in oxygen at 200°C for 10 h, Tc was enhanced by 5 K. Further annealing increased Tc by an additional 1 K and sharpened the transition. The thermopower shifts downward with increasing doping by oxygen annealing, resembling that of the Bi-based and Tl-based systems. The carrier concentration was estimated from thermopower data and the Tc value as ∼0.13 and ∼0.14 per Cu before and after oxygen annealing, respectively.

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JO - Physica C: Superconductivity and its Applications

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ER -

Thermopower and resistivity measurements on oxygen-annealed HgBa₂CaCu₂O_6+δ

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