Irradiation of HTS for Enhancement of Critical Current

Milliken, D.; Silver, T.; Dou, Shi Xue

doi:10.1007/3-540-27294-1_14

Cited by 1 publication

(1 citation statement)

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“…An examination of the volume of prior work [22][23][24][25][26][27][28][29] that has been done to characterize and model the behaviour of magnetic vortices in layered superconductors leads to the conclusion that pancake vortices would be the preferred vortex form if this extremely anisotropic material (the ratio of the in-plane resistivity to the normal direction resistivity in pure multilayer graphene is greater than 100 000:1) is superconducting [30,31]. A more specific conclusion (derived from the work by Pe, Benkraouda and Clem [24]) is that, for graphene stacks with interlayer distances of 0.2 nm and relatively long magnetic penetration depths (graphene and graphite are diamagnetic materials with significant magnetic anisotropy [32]), the interlayer coupling, if the material was a superconductor with a magnetic self-pinning attractive force, between pancake vortices in layers i and j is given as follows:…”

Section: Introductionmentioning

confidence: 99%

Evidence of superconductivity in doped graphite and graphene

Larkins

Vlasov

Holland

2015

Supercond. Sci. Technol.

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We have observed evidence of superconductivity at temperatures in the vicinity of 260 K in phosphorus-doped graphite and graphene. This evidence includes transport current, magnetic susceptibility, Hall effect and (pancake) vortex state measurements. All of these measurements indicate a transition which is that of a type II superconductor with no type I phase until below the limits of our measurement capabilities. Vortex states are inferred from periodically repeated steps in the resistance versus temperature characteristics of highly oriented pyrolytic graphite and exfoliated doped multilayer graphene. Magnetic susceptibility measurements have shown results qualitatively similar to those expected (and experimentally observed by others) for ultra-thin (thickness ≪λL) films. The magnetization is negative for field-cooled and zero-field-cooled measurements. The magnetization for field cooled and zero-field-cooled measurements begin to diverge at approximately 260 K. Hall effect measurements show a sign reversal in the Hall voltage as the temperature is reduced from 300 K to 78 K.

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