NbTi superconducting wires and applications

Zhang, Pingxiang; Li, Jianfeng; Guo, Qiang; Zhu, Yanmin; Yan, Kaijuan; Rui-Long, Wang; Zhang, Kailin; Liu, Xianghong; Feng, Yong

doi:10.1016/b978-0-12-815820-3.00010-1

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The selection of materials for technological devices typically depends on properties such as the superconducting gap (Δ), penetration depth (λ), coherence length (ξ), critical fields, and depairing critical current density (J 0 ) [15]. Among materials meeting high critical field and mechanical deformation tolerance criteria, NbTi alloy stands out, exhibiting a critical temperature (T c ) comparable to elemental Nb and, as known from its use in magnets, a much higher upper critical field (H c2 ) [16].…”

Section: Introductionmentioning

confidence: 99%

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Lee,

Yun,

Lee

et al. 2024

Phys. Scr.

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We present a study on the superconducting properties of 300 nm thick NbTi thin films grown by co-sputtering on silicon substrates at room temperature. The samples exhibit a Nb (50 at.%) and Ti (50 at.%) chemical composition, revealing a polycrystalline structure textured along the (110) axis of the body-centered cubic structure. The measured superconducting critical temperature (Tc ) was 9.65 K, and the upper critical field extrapolated to zero temperature reached approximately 15 T, resulting in a coherence length at zero temperature of approximately 4.7 nm. The penetration depth was determined through local magnetic force microscopy measurements conducted at temperatures from 4.25 to 7 K. The obtained values ranges from 250 (15) nm at 4.25 K to 370 (20) nm at 7 K. Extrapolating these measurements to zero temperature, we obtained an estimated value of 230 (20) nm. To extend the performance and potential applications of NbTi, we additionally grew a 150 nm thick sample on flexible polyimide. In this case, we observed that the films preserved their superconducting properties, displaying a decrease in Tc to 9.2 K and a similar upper critical field compared to samples grown on silicon. The feasibility of growing NbTi alloys at room temperature, with superconducting parameters comparable to or superior to metallic Nb for the upper critical field, renders this system promising for cryogenic applications, particularly in the development of high-performance electronic devices on both rigid and flexible substrates.

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Section: Introductionmentioning

confidence: 99%

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Lee,

Yun,

Lee

et al. 2024

Phys. Scr.

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“…In the context of superconducting alloys and composite materials, NbTi is a well-known material with high T C (≈10 K) and high critical current density, with wide application including current MRI system, NMR system, high-energy physics accelerators, plasma fusion reactors, sensors, instrumentation (SQUID) and in defense (radar) [18] etc. Its high critical magnetic field (B c2 ), high critical current density (I c ) together with its affordability and workability build the NbTi alloy an ideal candidate for fabricating superconducting magnet which is widely used for the area of physics, chemistry, material science and biology [19].…”

Section: Introductionmentioning

confidence: 99%

“…High temperature annealing in high vacuum condition helps Nb and Ti atoms to diffuse into each other and to form NbTi alloy. Compared to the conventional growth techniques [18], that are complex in nature and involve numerous steps, the presented diffusion mediated technique is rather simple while at the same time, the desired composition can be obtained by controlling the thickness of the constituent materials of the bilayer.…”

Section: Introductionmentioning

confidence: 99%

Diffusion mediated growth of superconducting Nb-Ti composite films by high temperature annealing

Sawle,

Awana,

Sahoo

2023

Phys. Scr.

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The fabrication of superconducting Nb-Ti alloy by high temperature annealing of Nb/Ti bilayer thin films is reported here. During the annealing process, Nb and Ti diffuse into each other and Nb-Ti composite film formation occurs at the interface of the bilayer. Two types of substrates, namely, SiO2/Si and Si3N4/Si are used to grow the bilayers of Nb/Ti by using dc magnetron sputtering. Annealing at temperature about 820C leads the substrates to take part into the diffusion process. The alloying of Nb-Ti and the effect of substrates on the structural properties are studied by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Ti-rich Nb-Ti phases are present in the XRD while interface studies through XPS confirms the interdiffusion of the two elements Nb and Ti along with the presence of the decomposed elements from the substrates. Appearance of nitride phases in case of Si3N4/Si substrate confirms the substrate’s involvement in the diffusion process. Further low temperature transport measurements are carried out to study the superconducting properties of the Nb-Ti composite films grown on both oxide (SiO2/Si) and nitride (Si3N4/Si) substrates. Nb-Ti composite films offer higher transition temperature (TC) compared to that of pure Nb with similar thickness used in Nb/Ti bilayer films. Higher normal state resistance (RN) with wider transition width for Nb-Ti on nitride substrate in comparison with the oxide substrate indicates a possible role of N atoms in tuning the disorder and hence controlling the transport properties. Finally, the presented method can be used to fabricate superconducting stoichiometric NbTi and NbTiN thin films for future phase slip and superconducting single photon detector-based applications.

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“…6 GPa 的压力下(TaNb) 0.67 (HfZrTi) temperature [41] . 工、成本低廉且具有耐久性等优点 [61][62][63][64][65] , 因此目前它是最成功、商业化应用最广泛的超导材料之一.…”

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Discovery of robust superconductivity against volume shrinkage

Guo,

Wu,

Sun

2023

Acta Phys. Sin.

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The superconducting transition temperature (Tc) of superconductors are connected intimately with multiple degrees of freedom of charge, spin, orbital and lattice. Many studies have indicated that pressure is an effective way to tune Tc though change of crystal and electronic structures. Here, we report a new progress made in the high-pressure studies – discovery of a new type of superconductors whose Tc is robust against large volume shrinkage under extremely high pressure, named as RSAVS (Robust Superconductivity Against Volume Shrinkage) superconductors. Initially, such a RSAVS behavior was observed in the high entropy alloys of (TaNb)0.67(HfZrTi)0.33and (ScZrNbTa)0.6(RhPd)0.4, followed in the widely-used NbTi alloy, as well as Nb and Ta elements. Analysis shows that this type of superconductors possesses a body-centered cubic crystal structure and is composed of transition metal elements. The observed results not only present new research topics but also raise the question about what determines Tc in conventional or unconventional superconductors.

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NbTi superconducting wires and applications

Cited by 7 publications

References 22 publications

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Diffusion mediated growth of superconducting Nb-Ti composite films by high temperature annealing

Discovery of robust superconductivity against volume shrinkage

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