A Spin Fluctuation Model for d-Wave Superconductivity
A Spin Fluctuation Model for d-Wave Superconductivity
复制标题
d波超导的自旋涨落模型
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Schmalian
中科院分区：
文献类型：
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作者：
A. Chubukov;D. Pines;J. Schmalian
识别导致超导性的微观机制和超导配对态的性质仍然是理论物理学中最令人兴奋的理论挑战之一[1]。在所谓的传统超导体中，在低于或相当于德拜频率的频率下，电子之间吸引的声子引起的相互作用胜过排斥的屏蔽库仑相互作用[2]，并带来超导性[3]。超导状态下的电子配对位于横波通道中。声子引起的相互作用在传统超导体中的首要地位已被非常清楚地证明。通过非弹性中子散射实验获得的声子态密度，以及通过隧道实验推导的介导配对的玻色子的光谱，在像 Pb[4,5] 这样的系统中非常吻合。除了同位素效应[6,7]之外，两个独立实验的比较通常被认为是声子介导的配对状态的非常可靠的证明。
The identification of the microscopic mechanisms responsible for superconductivity and the nature of the superconducting pairing state continues to represent one of the most exciting theoretical challenges in theoretical physics[1]. In the so-called conventional superconductors, at frequencies less than or comparable to the Debye frequency, the attractive phonon-induced interaction between electrons wins out over the repulsive screened Coulomb interaction[2] and brings about superconductivity[3]. The pairing of electrons in the superconducting state is in an s-wave channel. The primacy of phonon-induced interaction in conventional superconductors has been demonstrated with great clarity. The phonon density of states, obtained by inelastic neutron scattering experiments, and the spectrum of the bosons which mediate pairing, as deduced from tunneling experiments, agree very well in systems like Pb[4,5]. In addition to the isotope effect[6,7], this comparison of two independent experiments is generally considered to be a very reliable proof of a phonon-mediated pairing state.