Effect of two gaps on the flux-lattice internal field distribution: evidence of two length scales in Mg(1-x)AlxB2 from muSR.
Effect of two gaps on the flux-lattice internal field distribution: evidence of two length scales in Mg(1-x)AlxB2 from muSR.
复制标题
两个间隙对通量晶格内场分布的影响：来自 muSR 的 Mg(1-x)AlxB2 中两个长度尺度的证据。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
C. Baines
中科院分区：
文献类型：
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作者：
S. Serventi;G. Allodi;R. De Renzi;G. Guidi;L. Romanó;P. Manfrinetti;A. Palenzona;C. Niedermayer;A. Amato;C. Baines
我们测量了双能隙超导体MgB_2和电子掺杂化合物Mg(1-x)Al_xB_2在高达2.8T的磁场中磁通晶格(FL)态的横场Muon自旋进动。我们研究了这两个能隙对FL内场分布的影响，并由此确定了两个相干长度参数和掺杂对Lon穿透深度的依赖关系。这是对单晶中大涡旋的STM观测所提出的复杂涡旋结构的独立确定。我们的数据在数量上与STM一致，从而验证了一个新的内场唯象模型。
We have measured the transverse field muon spin precession in the flux-lattice (FL) state of the two-gap superconductor MgB2 and of the electron doped compounds Mg(1-x)AlxB2 in magnetic fields up to 2.8 T. We show the effect of the two gaps on the internal field distribution in the FL, from which we determine two coherence length parameters and the doping dependence of the London penetration depth. This is an independent determination of the complex vortex structure already suggested by the STM observation of large vortices in a MgB2 single crystal. Our data agree quantitatively with STM and we thus validate a new phenomenological model for the internal fields.