Berezinskii-Kosterlitz-Thouless transition in rhenium nitride films

被引：0

作者：

Takiguchi, Kosuke ^{[1
]}

Krockenberger, Yoshiharu ^{[1
]}

Taniyasu, Yoshitaka ^{[1
]}

Yamamoto, Hideki ^{[1
]}

机构：

[1] NTT Corp, NTT Basic Res Labs, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 2430198, Japan

来源：

PHYSICAL REVIEW B | 2024年 / 110卷 / 02期

关键词：

UPPER CRITICAL-FIELD; PHASE-TRANSITIONS; SUPERCONDUCTIVITY; BEHAVIOR; ZERO;

D O I：

10.1103/PhysRevB.110.024516

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The quest to manipulate and understand superconductivity demands exploring diverse materials and unconventional behaviors. Here, we investigate the Berezinskii-Kosterlitz-Thouless (BKT) transition in ReNx thin films, demonstrating their emergence as a compelling platform for studying this pivotal phenomenon. By systematically varying synthesis parameters, we achieve ReNx films exhibiting a BKT transition comparable to what is known from NbNx meander structure films. Detailed current-voltage measurements unlock the intrinsic parameters of the BKT transition, revealing the critical role of suppressed superconducting volume in pushing ReNx towards the two-dimensional limit. Utilizing this two-dimensional electron system, we employ Beasley-MooijOrlando theory to extract the vortex unbinding transition temperature and superelectron density at the critical point. Further confirmation of the BKT transition is obtained through temperature-dependent resistivity, current- voltage, and magnetoresistance measurements. Our findings suggest that native disorder and inhomogeneity within ReNx thin films act to suppress long-range coherence, ultimately driving the system towards the BKT regime. This work establishes ReNx as a promising material for exploring BKT physics and paves the way for tailoring its properties for potential applications in superconducting devices.

引用

页数：8

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