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首页> 外文期刊>Nature >Intertwined symmetry of the magnetic modulation and the flux-line lattice in the superconducting state of TmNi_2B_2C
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Intertwined symmetry of the magnetic modulation and the flux-line lattice in the superconducting state of TmNi_2B_2C

机译：TmNi_2B_2C超导状态下磁调制与通量线晶格的交织对称

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Materials that can in principle exhibit both superconductivity and ferromagnetism are caught in a dilemma: both states represent long-range order, but are in general mutually exclusive. When the material favours a ground state with a large magnetic moment, as is the case for Er_4Rh_4B (ref. 1), superconductivity is destroyed. For superconductivity to persist, the magnetic structure would need to adopt an antiferromagnetic modulation of short enough wavelength to ensure a small net moment on the length scale of the superconducting coherence length. The intermetallic boro-carbide superconductors RNi_2B_2C (where R is a rare-earth element) have shed new light on this balance between magnetism and superconductivity. The response of these materials in the superconducting state to a magnetic field is dominated by the formation of a flux-line lattice—a regular array of quantized magnetic vortices whose symmetry and degree of order are easily modified and thus can be expected to interact with an underlying magnetic modulation. In TmNi_2B_2C, superconductivity and anti-ferromagnetic modulated ordering coexist below 1.5 K (refs 5-7). Here we present the results of a small-angle neutron-scattering study of this compound which show that the structure of the magnetic modulation and the symmetry of the flux-line lattice are intimately coupled, resulting in a complex phase diagram.
机译：原则上可以同时显示超导性和铁磁性的材料陷入了两难境地：这两种状态都代表远距离有序，但通常互斥。当材料倾向于具有大磁矩的基态时（如Er_4Rh_4B的情况）（参考文献1），就会破坏超导性。为了保持超导性，磁性结构将需要采用足够短的波长的反铁磁调制，以确保在超导相干长度的长度尺度上具有较小的净矩。金属间碳化硼超导体RNi_2B_2C（其中R是稀土元素）为磁性和超导性之间的这种平衡提供了新的思路。这些材料在超导状态下对磁场的响应主要由磁通线晶格的形成决定。磁通线晶格是规则排列的量化磁涡旋的阵列，其对称性和阶数易于修改，因此有望与潜在的磁调制。在TmNi_2B_2C中，超导电性和反铁磁调制有序在1.5 K以下共存（参考文献5-7）。在这里，我们给出了对该化合物的小角度中子散射研究的结果，结果表明，磁调制的结构与通量线晶格的对称性紧密耦合，从而形成了复杂的相图。

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