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arXiv 2302.04758cond-mat.supr-concond-mat.str-el
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反常超导体 UTe2 中的准二维费米面

Quasi-2D Fermi surface in the anomalous superconductor UTe2

A. G. Eaton, T. I. Weinberger, N. J. M. Popiel, Z. Wu, A. J. Hickey, A. Cabala, J. Pospisil, J. Prokleska, T. Haidamak, G. Bastien, P. Opletal, H. Sakai, Y. Hag… 展开作者

A. G. Eaton, T. I. Weinberger, N. J. M. Popiel, Z. Wu, A. J. Hickey, A. Cabala, J. Pospisil, J. Prokleska, T. Haidamak, G. Bastien, P. Opletal, H. Sakai, Y. Haga, R. Nowell, S. M. Benjamin, V. Sechovsky, G. G. Lonzarich, F. M. Grosche, M. Valiska

AI总结:

通过测量原始质量 UTe2 晶体的磁量子振荡,直接探测其费米面,发现准二维圆柱形费米面且无三维部分,为自旋三重态超导配对机制及序参量对称性提供了强约束。

摘要:

重费米子顺磁体 UTe$_2$ 表现出自旋三重态超导的许多特征。由于对底层电子结构的不确定性,理解这种奇异超导微观细节的努力受到了阻碍。在此,我们通过测量原始质量晶体中的磁量子振荡,直接探测了 UTe$_2$ 的费米面。我们发现量子振荡频率和振幅的角分布特征表明存在准二维费米面,且该费米面可由两个圆柱形费米面片(分别为电子型和空穴型)很好地描述。此外,我们发现这两个圆柱形费米面片都具有相当大的起伏,但小尺度波纹可忽略不计,这可能使它们实现近嵌套,从而促进增强三重态配对机制的磁涨落。重要的是,我们没有发现任何三维费米面部分存在的证据。我们的结果对 UTe$_2$ 中超导序参量的可能对称性施加了强烈约束。

英文摘要:

The heavy fermion paramagnet UTe$_2$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details of this exotic superconductivity have been impeded by uncertainty regarding the underlying electronic structure. Here we directly probe the Fermi surface of UTe$_2$ by measuring magnetic quantum oscillations in pristine quality crystals. We find an angular profile of quantum oscillatory frequency and amplitude that is characteristic of a quasi-2D Fermi surface, which we find is well described by two cylindrical Fermi sheets of electron- and hole-type respectively. Additionally, we find that both cylindrical Fermi sheets possess considerable undulation but negligible small-scale corrugation, which may allow for their near-nesting and therefore promote magnetic fluctuations that enhance the triplet pairing mechanism. Importantly, we find no evidence for the presence of any 3D Fermi surface sections. Our results place strong constraints on the possible symmetry of the superconducting order parameter in UTe$_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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