A Study on Thermoelectric Power and Electrical Properties of Bi-2223 Superconductors Sintered for Different Time Periods
A Study on Thermoelectric Power and Electrical Properties of Bi-2223 Superconductors Sintered for Different Time Periods
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不同烧结时间Bi-2223超导体的热电势和电性能研究
DOI：
10.1007/s10948-008-0315-2
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
E. M. Elsheikh
中科院分区：
文献类型：
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作者：
S. Saleh;S. A. Ahmed;E. M. Elsheikh
对不同烧结时间的Bi_（1.75）Pb_（0.35）Sr_2Ca_2Cu_3 O_3样品进行了结构分析、电阻率和热电势测量。所有样品的热电功率均为正值，且随烧结时间的延长略有变化。仅用ρn=ρ（0）+aT方程分析正常态电阻率，结果令人满意。用Aslamazov和Larkin（AL）、Lawrence和Doniach（LD）以及Varlamov和Livanov（VL）模型研究了超导涨落行为。ln（Δσ/σ300）-ln（ε）曲线与理论预测一致，呈现出三个不同的区域，即临界区、平均场区和短波起伏区。估计了临界指数、零温度相干长度ζ（0）、层间距d、层间耦合ν和费米能EF等参数。研究了烧结时间对这些参数的影响。临界指数λ值表明所有研究样品的维度从2D交叉到3D。
Structure examination, resistivity, and thermopower measurements were made on samples of Bi1.75Pb0.35Sr2Ca2Cu3Oysintered for different time periods. Thermoelectric power of all samples was found to be positive and changes slightly with sintering time prolongation. The normal state resistivity was analyzed using only the equationρn=ρ(0)+aTwhich was found to be satisfactory. The superconducting fluctuation behavior has been investigated using the Aslamazov and Larkin (AL), Lawrence and Doniach (LD), and Varlamov and Livanov (VL) models. In agreement with the theoretical prediction, the ln (Δσ/σ300)−ln (ε) plots exhibited three different regions, namely critical, mean field, and short wave fluctuation regions. Some parameters such as critical exponents, zero temperature coherence lengthζ(0), the interlayer spacingd, the interlayer couplingν, and the Fermi energyEFhave been estimated. The effect of sintering time on such estimated parameters has been studied. The critical exponentλvalues have indicated dimensionality cross-over from 2D to 3D for all the investigated samples.
DOI：
10.1007/bf01303701
发表时间：
1986-01-01
期刊：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
影响因子：
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作者：
BEDNORZ, JG;MULLER, KA
通讯作者：
MULLER, KA
原位管内功率加工 MgB 的超导特性？
DOI：
--
发表时间：
2007
期刊：
Supercond. Sci. Technol. 20
影响因子：
--
作者：
H Yamada;N Uchiyama;A Matsumoto;H Kitaguchi;H Kumakura
通讯作者：
H Kumakura