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首页> 外文期刊>Physical review >Upper critical field and the Fulde-Ferrel-Larkin-Ovchinnikov transition in multiband superconductors
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Upper critical field and the Fulde-Ferrel-Larkin-Ovchinnikov transition in multiband superconductors

机译：多频带超导体中的上临界场和Fulde-Ferrel-Larkin-Ovchinnikov跃迁

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摘要

The effect of orbital and Zeeman pair breaking on the upper critical field H_(c2) and the Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) transition in clean anisotropic multiband superconductors is addressed. For a uniaxial superconductor with a single parabolic band, a close form equation for H_(c2)(T, θ) as functions of temperature T and the angle 6 between H and the c axis is obtained. The wave vector Q of the FFLO oscillations is shown to be not parallel to the magnetic field H if it is tilted away from the symmetry axis. For multiband superconductors, the crystalline anisotropy, and the s~± pairing symmetry with the sign change of the order parameter on different sheets of the Fermi surface can significantly increase the orbitally limited H_(c2) and facilitate the FFLO transition. It is shown that if shadow bands exist close to the Fermi level (as characteristic of ferropnictides), a small shift of the chemical potential upon doping can trigger the FFLO transition produced by emerging small pockets of the Fermi surface even for moderate values of the Maki parameter in the main bands.
机译：讨论了在干净的各向异性多频带超导体中，轨道和塞曼对破裂对上临界场H_（c2）和Fulde-Ferrel-Larkin-Ovchinnikov（FFLO）跃迁的影响。对于具有单个抛物线带的单轴超导体，获得了H_（c2）（T，θ）作为温度T和H与c轴之间的夹角6的函数的近似形式方程。如果FFLO振荡的波矢量Q倾斜远离对称轴，则它不平行于磁场H。对于多带超导体，结晶各向异性以及费米表面不同片上具有阶跃参数符号正负变化的s〜±对称性可以显着增加轨道受限的H_（c2）并促进FFLO跃迁。结果表明，如果阴影带存在于费米能级附近（作为除铁剂的特征），则掺杂后化学势的小幅变化甚至会触发费米表面新兴小口袋所产生的FFLO跃迁，即使Maki值适中也是如此。主频段中的参数。

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