Organic layered superconductors
Organic layered superconductors
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有机层状超导体
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
L. Bulaevskii
中科院分区：
文献类型：
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作者：
L. Bulaevskii
本文分析了有机化合物β-（ET）_2X的正常和超导性质的最新实验数据，并与（TMTSF）_2X作了比较。着重讨论了这些晶体的结构特点、电子能带结构、电阻率T2定律、Tc附近和低温下的超导性质以及无序对Tc的影响。本文认为电阻率中的T2项是由电子的库仑相互作用引起的。BCS模型对Tc附近的超导电性给出了满意的描述，但在高Tc化合物如βH-（ET）2 I3和β-（ET）2AuI 2中，BCS模型似乎不能描述Tc附近的超导电性。实验数据的温度依赖性的上临界场和超导间隙在这些化合物提供的证据，有利于一个非常强的耦合模型。
Abstract The recent experimental data on the normal and superconducting properties of organic compounds β-(ET)2X in comparison with (TMTSF)2X are analysed. Special attention is paid to the structural pecularities of these crystals, electron band structure, T 2 law of resistivity, the superconducting properties near T c and at low temperatures and the effect of disorder on T c. It is argued that the term T 2 in the resistivity arises from the Coulomb interaction of electrons. The BCS model gives a satisfactory description of superconductivity near T c but it seems to fail in the region T ≪ T c in high-T c compounds such as βH-(ET)2I3 and β-(ET)2AuI2. The experimental data on the temperature dependence of the upper critical field and the superconducting gap in these compounds provide evidence in favour of an extremely strong coupling model.