Competition between pinning produced by extrinsic random point disorder and superconducting thermal fluctuations in oxygen-deficient GdBa2Cu3O x coated conductors

Haberkorn, N.; Guimpel, J.; Suárez, S.; Lee, Jae-Hun; Lee, Hunju; Moon, Seung‐Hyun

doi:10.1088/1361-6668/ab5164

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…phonons). However, for materials where the observed T c does not solely depend on the electron-phonon interaction (in particular, in cuprates [51,53,54], pnictides [75][76][77] and nickelates [78,79]), but instead on the thermodynamic fluctuations [58,[80][81][82][83], the presence of pseudogap [84,85], structural disorder [86][87][88][89], system dimensionality [90][91][92][93][94] or other mechanisms [95][96][97][98] for charge carrier wave function distortions, our equations (11) and (12) might not be a good fitting tool (however, it does not necessarily mean that in some cases these equations will still be a good fitting tool). Based on all the above, alternative R(T, B) models may be developed for other types of materials.…”

Section: Discussionmentioning

confidence: 99%

Resistive transition of hydrogen-rich superconductors

Talantsev

Stolze

2021

Supercond. Sci. Technol.

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Critical temperature, T c, and transition width, ΔT c, are two primary parameters of the superconducting transition. The latter parameter reflects the superconducting state disturbance originating from the thermodynamic fluctuations, atomic disorder, applied magnetic field, the presence of secondary crystalline phases, applied pressure, etc. Recently, Hirsch and Marsiglio (2021 Phys. Rev. B 103 134505, doi: 10.1103/PhysRevB.103.134505) performed an analysis of the transition width in several near-room-temperature superconductors and reported that the reduced transition width, ΔT c/T c, in these materials does not follow the conventional trend of transition width broadening in applied magnetic field observed in low- and high-T c superconductors. Here, we present a thorough mathematical analysis of the magnetoresistive data, R(T, B), for the high-entropy alloy (ScZrNb)0.65[RhPd]0.35 and hydrogen-rich superconductors of Im-3m-H3S, C2/m-LaH10 and P63 /mmc-CeH9. We found that the reduced transition width, ΔT c/T c, in these materials follows a conventional broadening trend in applied magnetic field.

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Section: Discussionmentioning

confidence: 99%

Resistive transition of hydrogen-rich superconductors

Talantsev

Stolze

2021

Supercond. Sci. Technol.

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The effect of in situ irradiation on the superconducting performance of REBa2Cu3O7−δ-coated conductors

et al. 2023

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Commercial fusion power plants will require strong magnetic fields that can only be achieved using state-of-the-art high-temperature superconductors in the form of REBa2Cu3O7−δ-coated conductors. In operation in a fusion machine, the magnet windings will be exposed to fast neutrons that are known to adversely affect the superconducting properties of REBa2Cu3O7−δ compounds. However, very little is known about how these materials will perform when they are irradiated at cryogenic temperatures. Here, we use a bespoke in situ test rig to show that helium ion irradiation produces a similar degradation in properties regardless of temperature, but room-temperature annealing leads to substantial recovery in the properties of cold-irradiated samples. We also report the first attempt at measuring the superconducting properties while the ion beam is incident on the sample, showing that the current that the superconductor can sustain is reduced by a factor of three when the beam is on. Impact statement REBa2Cu3O7−δ high-temperature superconductors are an enabling technology for plasma confinement magnets in compact commercial fusion power plants, owing to their ability to carry very high current densities when processed as quasi-single crystals in the form of coated conductors. In service in a fusion device, the magnet windings will be exposed to a flux of fast neutrons that will induce structural damage that will adversely affect the superconducting performance, but very little data are currently available on the effect of irradiation at the cryogenic temperatures relevant for superconducting magnets. Moreover, even room-temperature annealing substantially affects superconducting properties after irradiation, so to obtain key technical data for fusion magnet designers, it is important to measure these properties in situ, under irradiation. This work shows that for the first time, it is important to consider how energetic particles directly influence superconductivity during irradiation because we observe a reduction in zero-resistance current by a factor of as much as three when an ion beam is incident on the sample. Although neutrons will not interact with the material in the same way as charged ions, primary knock-on ions from neutron damage are expected to have a similar effect to the He+ ions used in our study. Graphical abstract

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Competition between pinning produced by extrinsic random point disorder and superconducting thermal fluctuations in oxygen-deficient GdBa₂Cu₃O _x coated conductors

Cited by 2 publications

References 36 publications

Resistive transition of hydrogen-rich superconductors

Resistive transition of hydrogen-rich superconductors

The effect of in situ irradiation on the superconducting performance of REBa2Cu3O7−δ-coated conductors

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