Stable hc/e vortices in a gauge theory of superconductivity in strongly correlated systems.
Stable hc/e vortices in a gauge theory of superconductivity in strongly correlated systems.
复制标题
强相关系统超导规范理论中的稳定 hc/e 涡旋。
DOI：
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发表时间：
1992
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影响因子：
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通讯作者：
Sachdev
中科院分区：
文献类型：
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作者：
Sachdev
研究了具有强短程排斥相互作用的电子系统超导相的现象学模型{ital F}。内部U(1)规范对称的连接{粗体a}的涨落抑制了局部电荷涨落。在{ital H}{sub {ital c}1}以上，磁通量可以在整个超导阶段以通量{ital hc}/2{ital e}的涡流穿透超导体，但在某些情况下，最低能量的构型具有通量{ital hc}/{ital e}的涡流。利特尔和帕克斯等人的实验研究了周期性作为{动态变化}磁场的函数，总是观察到外部通量的周期为{动态hc}/2{动态e}。铜超导体CuO{sub 2}层模型的辛大{ital N}展开的低能性质可以用{ital F}很好地描述。这一分析和铜酸盐的一些正常状态性质表明，除非超导体-正常转变是强一阶的，否则在远离超导首次发生的绝缘状态的最低掺杂量下，{ital hc}/{ital e}漩涡应该是稳定的。
A phenomenological model {ital F} of the superconducting phase of electronic systems with strong short-range repulsive interactions is studied. Fluctuations of the connection {bold a} of an internal U(1) gauge symmetry suppress local charge fluctuations. Above {ital H}{sub {ital c}1}, magnetic flux can pierce the superconductor in vortices with flux {ital hc}/2{ital e} throughout the superconducting phase, but regimes are found in which the lowest-energy configuration has vortices with flux {ital hc}/{ital e}. Experiments by Little and Parks and others, which examine periodicities as a function of a {ital varying} magnetic field, always observe a period in external flux of {ital hc}/2{ital e}. The low-energy properties of a symplectic large-{ital N} expansion of a model of the CuO{sub 2} layers of the cuprate superconductors are shown to be well described by {ital F}. This analysis and some normal-state properties of the cuprates suggest that {ital hc}/{ital e} vortices should be stable at the lowest dopings away from the insulating state at which superconductivity first occurs, unless the superconductor-normal transition is strongly first order.