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説明:

A common thread in condensed matter physics is the coexistence of multiple types of orders. Understanding the competition among these orders is essential for developing comprehensive physical models. Unconventional superconductors are prototypical systems where the physics is determined by competing orders. The nature of superconducting orders may be unveiled by analyzing a local perturbation such as vortices. In particular, for thin films, the vortex magnetic profile is characterized by the Pearl length Λ , which is inversely proportional to the 2D superfluid density; hence, normally, also inversely proportional to the film thickness, 𝑑. Here we employ the scanning SQUID-on- tip microscopy technique to directly measure the Pearl length in NbSe2 films with thickness ranging from 3 to 53 layers. For films thicker than ten layers, we indeed find the expected dependence Λ ∝ 1⁄𝑑. However, six- layer films show a sharp increase of Λ deviating by a factor three from the expected value. This value remains fixed for films ranging from three to six layers. This unexpected behavior suggests the competition between orders where one order parameter resides only on the first and last layers of the film while the other is spread in all layers.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: NbSe2, vortex pearl length, scanning SQUID microscopy

刊行年月日: 2025-03-31

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 16 2696

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-025-57817-3

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更新時刻: 2026-02-16 16:30:41 +0900

MDRでの公開時刻: 2026-02-16 13:57:28 +0900