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首页> 外文期刊>Superconductor Science & Technology >Feshbach resonance and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors
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Feshbach resonance and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors

机译：多带FeAs基超导体中量子临界点附近的Feshbach共振和介观相分离

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摘要

High-T-c superconductivity in FeAs-based (pnictide) multilayers, evading temperature decoherence effects in a quantum condensate, is assigned to a Feshbach resonance (also called shape resonance) in the exchange-like interband pairing. The resonance is switched on by tuning the chemical potential at an electronic topological transition (ETT) near a band edge, where the Fermi surface topology of one of the subbands changes from one-dimensional (1D) to two-dimensional (2D) topology. We show that the tuning is realized by changing (i) the misfit strain between the superconducting planes and the spacers, (ii) the charge density, and (iii) the disorder. The system is at the verge of a catastrophe, i. e. near a structural and magnetic phase transition associated with the order-to-disorder phase transition of the stripes (analogous to the 1/8 stripe phase in cuprates). Fine tuning of both the chemical potential and the disorder pushes the critical temperature T-s of this phase transition to zero, giving a quantum critical point. Here the quantum lattice and magnetic fluctuations promote the Feshbach resonance of the exchange-like anisotropic pairing. This superconducting phase that resists the attacks of temperature is shown to be controlled by the interplay of the hopping energy between stripes and the quantum fluctuations. The superconducting gaps in the multiple Fermi surface spots reported by the recent ARPES experiment of Evtushinsky et al (2008 arXiv: 0809.4455) are shown to support the Feshbach scenario.
机译：在基于FeAs的（肽）多层膜中，高T-c超导性（在量子冷凝物中规避温度退相干效应）在交换式带间配对中被赋予Feshbach共振（也称为形状共振）。通过调整在带边缘附近的电子拓扑跃迁（ETT）处的化学势来打开谐振，子带之一的费米表面拓扑从一维（1D）变为二维（2D）拓扑。我们表明，通过改变（i）超导平面和隔离层之间的失配应变，（ii）电荷密度和（iii）无序来实现调谐。该系统正处于灾难的边缘，即e。接近与条带的有序到无序相变相关的结构和磁性相变（类似于铜酸盐中的1/8条带相）。对化学势和无序性的微调将这一相变的临界温度T-s推至零，从而给出了量子临界点。在这里，量子晶格和磁涨落促进了交换型各向异性配对的Feshbach共振。抵抗温度侵蚀的超导相显示为受条纹之间的跳跃能量和量子涨落的相互作用控制。 Evtushinsky等人（2008 arXiv：0809.4455）最近的ARPES实验报告显示，多个费米表面斑点中的超导间隙被证明支持Feshbach情景。

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