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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >The electronic conductivity mechanism in Bi-Sr-Ca-Cu-O glass-ceramics
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The electronic conductivity mechanism in Bi-Sr-Ca-Cu-O glass-ceramics

机译：Bi-Sr-Ca-Cu-O玻璃陶瓷中的电子传导机理

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摘要

The results of electrical conductivity measurements in Bi2O3-SrO-CaO-CuO glass-ceramics are reported. It is shown that a sharp increase in the conductivity observed at 460 degrees C is attributed to the crystallization of the Bi2Sr2CuO6 (Bi-2201) superconducting phase in the glass matrix. The mechanism of electrical conductivity in this glass-ceramic can be explained as a result of discontinuous metallic structures of the Bi-2201 phase which appear in the glass matrix during annealing. The low-temperature conductivity obeys the law sigma(T) = sigma(o) exp[(-T-o/T)(n)] with n changing from 1/4 to 1/2 with decrease in the temperature. This cross-over is related to a granular structure in which a parabolic Coulomb gap exists in the density of states N(E) near E-F. We also show that the superconductivity effect should be taken into account for T-1/2 conductivity behaviour. It is shown that the Bi-Sr-Ca-Cu-O glass after a very short heat treatment at 820 degrees C exhibits the superconducting transition. In the normal state the conductivity is typical for granular metals and the activation energy continuously decreases with decreasing temperature. [References: 12]
机译：报道了Bi 2 O 3 -SrO-CaO-CuO玻璃陶瓷中的电导率测量结果。结果表明，在460摄氏度下观察到的电导率的急剧增加归因于玻璃基质中Bi2Sr2CuO6（Bi-2201）超导相的结晶。可以解释这种玻璃陶瓷的电导率机理是由于Bi-2201相的不连续金属结构在退火过程中出现在玻璃基质中。低温电导率遵循定律sigma（T）= sigma（o）exp [（-T-o / T）（n）]，随着温度的降低，n从1/4变为1/2。该交叉与其中在E-F附近的状态N（E）的密度中存在抛物线型库仑间隙的粒状结构有关。我们还表明，对于T-1 / 2电导率行为，应考虑超导效应。结果表明，Bi-Sr-Ca-Cu-O玻璃在820摄氏度的条件下进行了非常短的热处理后，表现出超导转变。在正常状态下，粒状金属的电导率是典型的，活化能随温度降低而连续降低。 [参考：12]

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