Melting of the charge density wave by generation of pairs of topological defects in UTe2
Melting of the charge density wave by generation of pairs of topological defects in UTe2
复制标题
UTe2 中拓扑缺陷对的产生导致电荷密度波的熔化
DOI：
10.1038/s41567-024-02429-9
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发表时间：
2024
期刊：
影响因子：
19.6
通讯作者：
Madhavan, Vidya
中科院分区：
文献类型：
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作者：
Aishwarya, Anuva;May-Mann, Julian;Almoalem, Avior;Ran, Sheng;Saha, Shanta R.;Paglione, Johnpierre;Butch, Nicholas P.;Fradkin, Eduardo;Madhavan, Vidya
拓扑缺陷是有序相中的奇点，它可以对相变产生深远的影响，并作为了解有序参数的窗口。拓扑缺陷的例子包括电荷密度波中的位错和超导体或对密度波中的涡旋，其中后者是具有有限动量的库珀对的凝聚。在这里，我们证明了拓扑缺陷在磁场诱导的重费米子超导体UTe2中电荷密度波消失中所起的作用。揭示了正负相绕组电荷密度波的一对拓扑缺陷。这些对在电荷密度波幅上与零点直接相关，并且随着磁场的增加而增加。磁场会产生超导和双密度波序列的涡旋，这会在电荷密度波中产生拓扑缺陷，并在上临界场下诱导实验观察到的这种电荷序列的熔化。我们的工作揭示了磁场产生的拓扑缺陷在UTe2电荷密度波有序参数熔化中的重要作用，并支持了表面存在双密度波有序。
Topological defects are singularities in an ordered phase that can have a profound effect on phase transitions and serve as a window into the order parameter. Examples of topological defects include dislocations in charge density waves and vortices in a superconductor or pair density wave, where the latter is a condensate of Cooper pairs with finite momentum. Here we demonstrate the role of topological defects in the magnetic-field-induced disappearance of a charge density wave in the heavy-fermion superconductor UTe2. We reveal pairs of topological defects of the charge density wave with positive and negative phase winding. The pairs are directly correlated with zeros in the charge density wave amplitude and increase in number with increasing magnetic field. A magnetic field generates vortices of the superconducting and pair density wave orders that can create topological defects in the charge density wave and induce the experimentally observed melting of this charge order at the upper critical field. Our work reveals the important role of magnetic-field-generated topological defects in the melting of the charge density wave order parameter in UTe2and provides support for the existence of a pair density wave order on the surface.
DOI：
10.1073/pnas.2206481119
发表时间：
2022-08-02
影响因子：
11.1
作者：
通讯作者：
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