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首页> 外文期刊>new journal of physics >Competition between orbital effects, Pauli limiting, and Fulde-Ferrell-Larkin-Ovchinnikov states in 2D transition metal dichalcogenide superconductors
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Competition between orbital effects, Pauli limiting, and Fulde-Ferrell-Larkin-Ovchinnikov states in 2D transition metal dichalcogenide superconductors

机译：二维过渡金属硫族化物超导体中的轨道效应、泡利极限和 Fulde-Ferrell-Larkin-Ovchinnikov 态之间的竞争

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摘要

We compare the upper critical field of bulk single-crystalline samples of the two intrinsic transition metal dichalcogenide superconductors, 2H-NbSe2 and 2H-NbS2, in high magnetic fields where their layer structure is aligned strictly parallel and perpendicular to the field, using magnetic torque experiments and a high-precision piezo-rotary positioner. While both superconductors show that orbital effects still have a significant impact when the layer structure is aligned parallel to the field, the upper critical field of NbS2 rises above the Pauli limiting field and forms a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state, while orbital effects suppress superconductivity in NbSe2 just below the Pauli limit, which excludes the formation of the FFLO state. From the out-of-plane anisotropies, the coherence length perpendicular to the layers of 31 angstrom in NbSe2 is much larger than the interlayer distance, leading to a significant orbital effect suppressing superconductivity before the Pauli limit is reached, in contrast to the more 2D NbS2.
机译：我们比较了两种本征过渡金属硫族化物超导体 2H-NbSe2 和 2H-NbS2 的块状单晶样品在高磁场中的上临界场，其中它们的层结构严格平行并垂直于磁场，使用磁力矩实验和高精度压电旋转定位器。虽然两种超导体都表明，当层结构平行于场对齐时，轨道效应仍然具有显着影响，但 NbS2 的上临界场上升到泡利极限场以上并形成 Fulde-Ferrell-Larkin-Ovchinnikov （FFLO） 状态，而轨道效应抑制了 NbSe2 中的超导性，略低于泡利极限，这排除了 FFLO 态的形成。从面外各向异性来看，NbSe2中垂直于31埃层的相干长度远大于层间距离，导致在达到泡利极限之前抑制超导性的显着轨道效应，与更多的二维NbS2形成鲜明对比。

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