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Growth of Single Crystals of MgCNi_3

机译：MgCNi_3单晶的生长

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摘要

In spite of the large number of ferromagnetic Ni atoms in its unit cell, MgCNi_3 shows superconductivity rather than magnetism. According to band-structure calculations, MgCNi_3 is near a ferromagnetic instability due to the high density of states at the Fermi level. However, whether or not the ferromagnetism in the formation of spin fluctuation remains is still unclear. The magnetism in the superconductivity can result in spin-triplet superconductivity or spin-affected conductivity. Moreover, the superconducting origin of this material has not yet been clearly identified, and the experimental results are still conflicting. For example, both s and non-s wave gap symmetry were observed by using various experimental tools. Also, the electron-phonon coupling constants in the conventional phonon-mediated pairing mechanism extracted from a number of specific heat measurements were different. Even the charge carrier for this material is also controversial. Band calculations predicted a hole charge carrier or the coexistence of a hole and an electron. However, Hall and thermoelectric power measurements showed that electrons are the charge carriers. In addition, physical interpretations, even of the same measurements, are different.
机译：尽管其晶胞中有大量铁磁性Ni原子，但MgCNi_3仍显示出超导性而不是磁性。根据能带结构计算，由于在费米能级的高密度态，MgCNi_3接近铁磁不稳定性。但是，尚不清楚是否存在自旋起伏形成中的铁磁性。超导中的磁性会导致自旋三重态超导或自旋影响的电导率。而且，这种材料的超导起源尚未被清楚地确定，并且实验结果仍然是矛盾的。例如，使用各种实验工具都可以观察到s和非s的波隙对称性。而且，从许多比热测量中提取的常规声子介导的配对机理中的电子-声子耦合常数是不同的。甚至这种材料的电荷载体也是有争议的。带计算可预测空穴载流子或空穴与电子的共存。但是，霍尔和热电功率测量表明，电子是电荷载流子。此外，即使是相同的测量，其物理解释也不同。

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