A brief review of recent superconductivity research at NIST

Lundy, D. R.; Swartzendruber, L. J.; Bennett, L. H.

doi:10.6028/jres.094.018

Cited by 8 publications

(3 citation statements)

References 114 publications

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“…Furthermore, the difference can be explained by the fabrication technique , and the effective cross section of a fabricated sawtooth structure (the inset to Figure ). The main reason is the surface damage caused by both the laser lithography and IBE techniques from water exposure, ion implantation, and overheating causing loss of oxygen . The water exposure from the photoresist development can reduce the overall starting superconductor thickness.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

Guided Vortex Motion Control in Superconducting Thin Films by Sawtooth Ion Surface Modification

Jones

Lam

et al. 2020

ACS Appl. Mater. Interfaces

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Design of flux profile and guided motion of magnetic flux quanta (also known as vortices) are central issues for functionality of superconducting devices. Anchoring vortex movement by trapping flux lines through the use of defects and preventing vortex entry by shielding magnetic field have been broadly explored, which can also enable reduction of noise for optimal device operation. Removing vortices entirely via the so-called ratchet effect (employing an asymmetric energy potential) is another alternative. This ratcheting potential is also used in DNA splitting, particle separation, surface atom electromigration, and electrophoresis. Utilizing a superconductor with the ratchet vortex pinning potential induces a dominant motion direction, which can be used to pump flux out from device functional zones. In this work, a varying thickness superconductor with its tailored intrinsic pinning mechanism has been simulated and proven to provide this preferential vortex motion. We demonstrate both theoretically and experimentally that a varying thickness superconducting ratchet is indeed possible. Furthermore, the sawtooth shape of the bridge provides a tunability to the preferred vortex motion direction, dependent on the ramp gradient and intrinsic pinning strength.

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Section: Comparison To Experimentsmentioning

confidence: 99%

Guided Vortex Motion Control in Superconducting Thin Films by Sawtooth Ion Surface Modification

Jones

Lam

et al. 2020

ACS Appl. Mater. Interfaces

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“…NIST has been conducting superconductivity research since 1916 (Lundy et al, 1989). Several divisions at NIST have active material research for superconducting material that function at temperatures greater than 100 K. In general, because SMES only offer a few hours of storage, they have limited application to residential storage.…”

Section: Figure 2 Fraunhofer Ise Comparison Of Rated Power Energy Comentioning

confidence: 99%

Potential Research Areas in Residential Energy Storage for NIST’s Engineering Laboratory

Kedzierski¹,

Payne²,

Skye³

2014

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This paper recommends research that is required to develop and, thus, enable cost effective, residential electricity storage systems for renewable energy. As residential electricity generation from renewable sources becomes more prevalent, residential energy storage will become an important factor in ensuring the stability of the electrical grid; grid operators will be able to timeshift demand to smooth peaks and match supply capacity. However, local storage of excess energy from renewable sources is currently not economically attractive due to the long payback period required to recover capital costs. NIST Engineering Laboratory is well positioned to make significant contributions to the relatively neglected field of residential energy storage. Possession of the NIST's Net-Zero Energy Residential Test Facility makes it possible to work collaboratively with other laboratories within NIST to demonstrate field performance of new ideas in energy storage technologies such as batteries, super capacitors, superconducting magnets, and hydrogen storage. In addition, EL staff and facilities are well matched to projects in Phase Change Material (PCM) facades and PCM evaporators, pumped hydro, solar water heaters and cost/benefit analyses. Potential project ideas are provided for these areas of research.1 Corresponding author. Tel./fax: (301) 975-5282/(301) 975-8973. E-mail address: Mark.Kedzierski@NIST.gov iii This publication is free of charge from: http://dx.

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“…An increase in J c would also then imply an increase in I c . Furthermore, YBCO films would not be treated by a potentially harmful ion/chemical etching process (overheating, loss of oxygen, Ar-ion implantation) and additionally exposed to moisture causing degradation 15 during handling.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the critical current of YBa2Cu3O7 thin films by substrate nanoengineering

Jones

Lam

et al. 2018

Journal of Applied Physics

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The critical current density, J c, can be increased by introducing defects throughout YBa 2Cu 3O 7 superconducting thin films. We propose a new approach of substrate nanoengineering to produce wellcontrolled defects. LaAlO 3 substrates have been ion-etched with different 34 nm deep patterns prior to the deposition of the films. An annealing step at 1000 °C after substrate etching has been undertaken to negate the Ar-ion damage to the surface. The J c of the so-prepared samples measured at different temperatures has been compared to thin films deposited on plain substrates at the same time. In general, an increase in J c is observed across all temperatures and fields as a result of both patterning and annealing. In particular, at zero field and 85 K, the largest enhancement of > 40% has been recorded for circle and triangle patterns. This new substrate nanoengineering technique is very promising for flux trapping of superconducting devices, particularly because an increase to critical current (I c) also occurs. Further optimization of depth, size, and shape of the patterns is expected to produce further improvements to J c.

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A brief review of recent superconductivity research at NIST

Cited by 8 publications

References 114 publications

Guided Vortex Motion Control in Superconducting Thin Films by Sawtooth Ion Surface Modification

Guided Vortex Motion Control in Superconducting Thin Films by Sawtooth Ion Surface Modification

Potential Research Areas in Residential Energy Storage for NIST’s Engineering Laboratory

Enhancing the critical current of YBa2Cu3O7 thin films by substrate nanoengineering

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