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In the framework of the weak coupling theory of superconductivity, we have proved that spin and charge fluctuations in the high-Tc superconductors can pro-duce respectively, pair-breaking and pair-forming effects on the superconductivity resulting from the "generalized BCS mechanism". With the coupling constant for spin fluctuations larger than that for charge fluctuations, they combine to produce a temperature-dependent effective pair-breaking effect, which makes Tc decrease more rapidly than Δ(0), the superconducting gap at T=0, and therefore, enhances the ratio 2Δ(0)/Tc. This provides a reasonable physical interpretation for the relevant experimental results. 相似文献
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在稀磁合金中,由于杂质与传导电子的交换作用,使这类系统的低温电子特性表现出一系列的反常.最早观测到的是在电阻随温度变化的曲线上出现极小;其次是磁化率偏离居里定律,有效磁矩随温度降低连续减小,以及比热和热功率在低温下出现宽峰等一系列反常现象.日本物理学家近藤(J.Kondo)首先对电阻极小现象作出了正确的理论解释,并提出了深入研究的基本问题,大大活跃了这一研究领域,从此人们将稀磁合金中低温反常?... 相似文献
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Heat—Activated Effect of Exchange Coupling Between Two Ferromagnets Separated by an Amorphous Semiconducting Barrier 下载免费PDF全文
We try to extend our previous zero-temperature tunnelling theory for the exchange coupling between two ferromagnets separated by an amorphous semiconducting barrier to the case of finite temperature,The result exhibits that the tunnelling electrons can absorb or emit phonons when they tunnel through the amorphous barrier at finite temperatures so that the interlayer exchange coupling is heat activated.This agrees with the experiments. 相似文献
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