Fabrication of superconducting nanowires from ultrathin MgB2 films via focused ion beam milling

Zhang, Chen; Wang, Da; Liu, Zhenghao; Zhang, Yan; Ma, P.; Feng, Qian; Wang, Yue; Gan, Zizhao

doi:10.1063/1.4914019

Cited by 12 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A second data set for MgB 2 in ref. [30] gives an almost identical fit to that shown in Figure 4(d).…”

Section: Multiple Bandssupporting

confidence: 59%

“…Panels (a) to (d) are for strongly-coupled bands while (e) to (h) are for effectively decoupled bands. References for the raw J c (sf) data sets are: (a) Ba(Fe,Co) 2 As 2 , [27] (b) Ba(Fe,Zn) 2 As 2 , [28] (c) MgB 2 , [29] (d) MgB 2 , [30] (e) Al, [31] (f) Nb [15] and (g) FeSe 1/2 Te 1/2 . [32] Panel (h) shows data for a two-phase film of nominal composition HgBa 2 CaCu 2 O 6 (Hg1212) with intergrowths of Hg1201.…”

Section: Different Topologiesmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

View full text Add to dashboard Cite

Key questions for any superconductor include: what is its maximum dissipation-free electrical current (its 'critical current') and can this be used to extract fundamental thermodynamic parameters? Present models focus on depinning of magnetic vortices and implicate materials engineering to maximise pinning performance. But recently we showed that the self-field critical current for thin films is a universal property, independent of microstructure, controlled only by the penetration depth. Here we generalise this observation to include thin films, wires or nanowires of singleor multi-band s-wave and d-wave superconductors. Using extended BCS equations we consider dissipation-free self-field transport currents as London-Meissner currents, avoiding the concept of pinning altogether. We find quite generally, for type I or type II superconductors, the current is limited by the relevant critical field divided by the penetration depth. Our fits to 64 available data sets, from zinc nanowires to compressed sulphur hydride with critical temperatures of 0.65 to 203 K, respectively, are excellent. Extracted London penetration depths, superconducting energy gaps and specific heat jumps agree well with reported bulk values. For multiband or multiphase samples we accurately recover individual band contributions and phase fractions.

show abstract

“…A second data set for MgB 2 in ref. [30] gives an almost identical fit to that shown in Figure 4(d).…”

Section: Multiple Bandssupporting

confidence: 59%

Section: Different Topologiesmentioning

confidence: 99%

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

View full text Add to dashboard Cite

show abstract

“…At p=0.18, the Jc s.f. for the (Y,Gd)123+BHO CC achieves a maximum value of 130 MA/cm 2 at 4.2 K. This is higher than previously reported for any superconducting material [6,9,11,13,17,38] except nanowires and ultra-thin films (where the flux pinning mechanism is different) [39][40][41]. The Jc s.f.…”

Section: The Dramatically Higher Jc At All Temperaturesmentioning

confidence: 61%

Thermodynamic approach for enhancing superconducting critical current performance

et al. 2022

View full text Add to dashboard Cite

The addition of artificial pinning centers has led to an impressive increase in the critical current density (Jc) of superconductors, enabling record-breaking all-superconducting magnets and other applications. The Jc of superconductors has reached ~0.2–0.3 Jd, where Jd is the depairing current density, and the numerical factor depends on the pinning optimization. By modifying λ and/or ξ, the penetration depth and coherence length, respectively, we can increase Jd. For (Y0.77Gd0.23)Ba2Cu3Oy ((Y,Gd)123), we can achieve this by controlling the carrier density, which is related to λ and ξ. We can also tune λ and ξ by controlling the chemical pressure in Fe-based superconductors, i.e., BaFe2(As1−xPx)2 films. The variation in λ and ξ leads to an intrinsic improvement in Jc via Jd, allowing extremely high values of Jc of 130 MA/cm2 and 8.0 MA/cm2 at 4.2 K, consistent with an enhancement in Jd of a factor of 2 for both incoherent nanoparticle-doped (Y,Gd)123 coated conductors (CCs) and BaFe2(As1−xPx)2 films, showing that this new material design is useful for achieving high critical current densities in a wide array of superconductors. The remarkably high vortex-pinning force in combination with this thermodynamic and pinning optimization route for the (Y,Gd)123 CCs reached ~3.17 TN/m3 at 4.2 K and 18 T (H||c), the highest values ever reported for any superconductor.

show abstract

“…This is essentially due to the fact that current SNSPDs are fabricated using mostly conventional low-temperature superconductors, such as NbN and WSi [10,11], in order to achieve high sensitivity and to simplify nanofabrication processes. Several efforts have been made to realize nanowires with high critical temperature (T c ) materials, including MgB 2 and cuprate superconductors [12][13][14][15]. The recently discovered iron-based superconductors have attracted great interest to explore their potentialities in the field of large-scale current transport [16,17] and in microelectronics or nanoelectronics applications [18,19].…”

Section: Introductionmentioning

confidence: 99%

Iron-Based Superconducting Nanowires: Electric Transport and Voltage-Noise Properties

et al. 2020

View full text Add to dashboard Cite

The discovery of iron-based superconductors paved the way for advanced possible applications, mostly in high magnetic fields, but also in electronics. Among superconductive devices, nanowire detectors have raised a large interest in recent years, due to their ability to detect a single photon in the visible and infrared (IR) spectral region. Although not yet optimal for single-photon detection, iron-based superconducting nanowire detectors would bring clear advantages due to their high operating temperature, also possibly profiting of other peculiar material properties. However, there are several challenges yet to be overcome, regarding mainly: fabrication of ultra-thin films, appropriate passivation techniques, optimization of nano-patterning, and high-quality electrical contacts. Test nanowire structures, made by ultra-thin films of Co-doped BaFe2As2, have been fabricated and characterized in their transport and intrinsic noise properties. The results on the realized nanostructures show good properties in terms of material resistivity and critical current. Details on the fabrication and low temperature characterization of the realized nanodevices are presented, together with a study of possible degradation phenomena induced by ageing effects.

show abstract

Fabrication of superconducting nanowires from ultrathin MgB2 films via focused ion beam milling

Cited by 12 publications

References 26 publications

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Thermodynamic approach for enhancing superconducting critical current performance

Iron-Based Superconducting Nanowires: Electric Transport and Voltage-Noise Properties

Contact Info

Product

Resources

About