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arXiv 1607.02807cond-mat.supr-con
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第二类超导体Abrikosov晶格中的霍尔效应

Hall Effect in the Abrikosov Lattice of Type-II Superconductors

Wataru Kohno, Hikaru Ueki, Takafumi Kita

摘要:

本文从超导的增广准经典方程出发,研究了超导体中洛伦兹力引起的涡旋充电。我们的数值研究的s波涡旋晶格范围内$H_{\rm{c}1} < H < H_{\rm{c}2}$表明,每个涡核与一个单一的通量量子也积累电荷,由于循环的超电流,并有一个霍尔电压的核心。在核心中心处的电荷密度的场依赖性由$H(H_{\rm{c}2}-H)$很好地描述,其中在$H_{\rm{c}2}/2$附近具有源自增加的磁场和减小的对电势之间的竞争的峰。在低温下,半径为$0.5ξ_0$的核心区域中积累的电荷的峰值估计为大约$ηΔ_{0}/(k_{\rm F}ξ_0)\times|e|$ C/$Δz=1$ nm,其中$η\equivπε_0Δz/|e|^2=1.09\times10^{18}$ ${\rm{J^{-1}}}$和$e<0$是电子的电荷,$Δ_0$是在$T=0$处的能隙,$k_{\rm F}$是费米波数,$ξ_0$是在$T=0$处的相干长度。

英文摘要:

We study vortex charging caused by the Lorentz force on supercurrent based on the augmented quasiclassical equa- tions of superconductivity. Our numerical study on an s-wave vortex lattice in the range $H_{\rm{c}1} < H < H_{\rm{c}2}$ reveals that each vortex core with a single flux quantum also accumulates charge due to the circulating supercurrent and has a Hall voltage across the core. The field dependence of the charge density at the core center is well described by $H(H_{\rm{c}2}-H)$ with a peak near $H_{\rm{c}2}/2$ originating from competition between the increasing magnetic field and the decreasing pair potential. The peak value of the accumulated charge in a core region of radius $0.5ξ_0$ is estimated to be about $ηΔ_{0}/(k_{\rm F}ξ_0)\times|e|$ C per $Δz=1$ nm along the flux line at low temperatures, where $η\equivπε_0Δz/|e|^2=1.09\times10^{18}$ ${\rm{J^{-1}}}$ with $e<0$ the charge of an electron, $Δ_0$ the energy gap at $T=0$, $k_{\rm F}$ the Fermi wave number, and $ξ_0$ the coherence length at $T=0$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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