Investigation of the Pauli paramagnetic effect in systematically tuned NbN thin films

Wang, Xiaoni; Wang, Lijie; Liu, Yixin; Gao, Wanpeng; Wu, Yu; Xu, Zulei; Jiang, Hua; Zhang, Lu; Peng, Wei; Wang, Zhen; Li, Wei; Mu, Gang; Lin, Zhirong

doi:10.1016/j.physc.2023.1354223

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…It is worth noting that the critical transition temperature T c of NbN films and nanowires can be tuned over a wide range by the growth parameters [19,25], such as the argon/nitrogen ratio and the chamber pressure, during sputtering. Here we investigate the physical properties of NbN system with T c at around 8.8 K. In figure 1(d), we show a typical set of resistance R data of sample S-1 under the magnetic field H ∥ y.…”

Section: Resultsmentioning

confidence: 99%

“…High-quality NbN films were prepared by dc reactive magnetron sputtering on high-resistivity Si substrates at room temperature. The details of the film growth and characterization have been reported previously [19]. The electrodes for the transport measurements were patterned using direct writing photo-lithography (PL) machine (DWL66+).…”

Section: Nbn Nanowire Fabricationmentioning

confidence: 99%

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Size effect on the response of superconductivity in NbN nanowires to external magnetic field

Xu,

Wang,

Liu

et al. 2024

Supercond. Sci. Technol.

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Reducing the negative impact of magnetic vortex motion is a long-term challenge for superconducting applications. Here, we conduct an in-depth investigation on the response of NbN nanowires on applied magnetic fields with the transverse size down to 10 nm. It is found that the vortex-free state can sustain under field up to 9 T in the sample of this dimension, demonstrating a unique approach to reduce the negative effects of flux motion in applications. Such a conclusion is further confirmed by the vanished flux-low instability velocity. Moreover, the upper critical field of the NbN nanowires reveals clear anisotropic features, which can be interpreted based on the framework of the Ginzburg–Landau model. Our results provide important information for understanding the behavior of nanoscale superconducting materials under magnetic fields, which is significant for the application of superconducting micro/nano devices.

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Section: Resultsmentioning

confidence: 99%

Section: Nbn Nanowire Fabricationmentioning

confidence: 99%

Size effect on the response of superconductivity in NbN nanowires to external magnetic field

Xu,

Wang,

Liu

et al. 2024

Supercond. Sci. Technol.

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“…Firstly, we deposited the highquality NbN films with thickness of 9 nm on Si substrates by dc reactive magnetron sputtering. Details of the film growth and characterization have been reported previously [24]. In order to increase the normal-state resistance of the nanowires and thus obtain a high probability of the occurrence of QPS [8], we use Si substrates which do not match the NbN lattice and a low sputtering temperature (room temperature) to guarantee a high degree of disorder in the NbN SC films.…”

Section: Nbn Nanowire Fabricationmentioning

confidence: 99%

Evolution of phase slips with wire width and observation of critical-voltage feature without high-impedance environment in NbN nanowires

Wang,

Xu,

Liu

et al. 2024

Supercond. Sci. Technol.

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Quantum phase slip (QPS) is an important effect that occurs in one-dimensional (1D) or quasi-1D superconducting materials. Due to the extremely high requirements on the uniformity and quality of superconducting nanowires, currently it is very challenging to obtain repeatable and controllable QPS devices. Here we report a systematic study of the QPS effect in NbN superconducting nanowires. High-quality NbN nanowires with different widths are fabricated by combining the processes of photo-lithography, electron beam lithography, and inductively coupled plasma etching. It is found that the electrical transport of the nanowires showed a systematic evolution with the wire width, and a clear evolution from single to multiple QPS events with the decrease of wire width is uncovered in the low temperatures. Based on these experimental results, the phase diagram reflecting the evolution of the physical state of the nanowires with wire width and temperature is obtained. In addition, we observed the features of critical voltage, which is a characteristic of the occurrence of coherent QPS (cQPS), in the samples with the width of 36 nm in the multiple QPS region. It is worth noting that such a cQPS behavior was detected in a non-high-impedance environment.

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Robust quantum Griffiths singularity above 1.5 K in nitride thin films

Wang

Liu

et al. 2023

Phys. Rev. B

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Investigation of the Pauli paramagnetic effect in systematically tuned NbN thin films

Cited by 3 publications

References 35 publications

Size effect on the response of superconductivity in NbN nanowires to external magnetic field

Size effect on the response of superconductivity in NbN nanowires to external magnetic field

Evolution of phase slips with wire width and observation of critical-voltage feature without high-impedance environment in NbN nanowires

Robust quantum Griffiths singularity above 1.5 K in nitride thin films

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