High-temperature superconductivity at 25: Still in suspense

Mann, Adam

doi:10.1038/475280a

Cited by 43 publications

(39 citation statements)

References 6 publications

(3 reference statements)

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“…This shows that the fermions are paired which became known as Cooper pairing [170], [173]- [176]. This is a unique phenomenon that happens at low temperatures.…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

“…This is a unique phenomenon that happens at low temperatures. Normally, electrons would repel each other due to each having a negative charge as stated by Coulomb repulsion [170], [173]- [176]. At low temperatures, the positive ions of the lattice will be attracted to the electrons enough to move toward it and create an area of positive charge density surrounding that area in the lattice [170], [173]- [176].…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

“…Normally, electrons would repel each other due to each having a negative charge as stated by Coulomb repulsion [170], [173]- [176]. At low temperatures, the positive ions of the lattice will be attracted to the electrons enough to move toward it and create an area of positive charge density surrounding that area in the lattice [170], [173]- [176]. If the positive charge created is high enough, it will attract other electrons and overcome their repulsion to each other to create a pair [170], [173]- [176].…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

“…At low temperatures, the positive ions of the lattice will be attracted to the electrons enough to move toward it and create an area of positive charge density surrounding that area in the lattice [170], [173]- [176]. If the positive charge created is high enough, it will attract other electrons and overcome their repulsion to each other to create a pair [170], [173]- [176]. After this electron-phonon interaction develops a Cooper pair, the result adds the half spin electrons to create a boson [170], [173]- [176].…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

“…If the positive charge created is high enough, it will attract other electrons and overcome their repulsion to each other to create a pair [170], [173]- [176]. After this electron-phonon interaction develops a Cooper pair, the result adds the half spin electrons to create a boson [170], [173]- [176].…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

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Doping as a Possible Means to create Superconductivity in Graphene

Holland¹

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The possibility of creating superconductivity in Highly Oriented Pyrolytic Graphite (HOPG) by means of doping was investigated. Bulk HOPG samples were doped with phosphorous using either ion-implantation or by Chemical Vapor Deposition growth with phosphine in the gas mixture. The methods for testing the graphene samples, once doped, were done by performing R vs. T measurements, and determining via observation suppressed superconductive characteristics signaling the presence of the Meissner Effect in a strong applied magnetic field. Before doping, the resistance vs. temperature (R vs. T) characteristic of the HOPG was measured. The R vs. T characteristic was again measured after doping, and for surface multilayers of graphene exfoliated from the post doped bulk sample. A 100 to 350 mT magnetic field was supplied, and the R vs. T characteristic was re-measured on a number of samples.Phosphorous-implanted HOPG samples exhibit deviations from the expected rise in resistance as the temperature is reduced to some point above 100 K. The application of a modest magnetic field reverses this trend. A step in resistance at a temperature of approximately 50-60 K in all of the samples is clearly observed, as well as a second step iv at 100-120 K, a third at a temperature range of 150-180 K and a fourth from about 200-240 K. A response consistent with the presence of magnetic field flux pancake vortices in phosphorous implanted HOPG and in phosphorous-doped exfoliated multilayer graphene has been observed. The lack of zero resistance at low temperatures is also consistent with pancake vortex behaviour in the flux-flow regime. The presence of magnetic vortices requires, and is direct evidence of superconductivity.

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“…This shows that the fermions are paired which became known as Cooper pairing [170], [173]- [176]. This is a unique phenomenon that happens at low temperatures.…”

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

Section: Inherent Superconductive Traitsmentioning

confidence: 99%

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Doping as a Possible Means to create Superconductivity in Graphene

Holland¹

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Electronic Conductivity

2016

Perovskites

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Lanthanides: Superconducting Materials

santos‐García

Alario-Franco

Sáez-Puche

2012

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Since the discovery of superconductivity in mercury by the Dutch physicist Heike Kamerlingh Onnes a century ago, in 1911, hundreds of superconducting materials including elements, intermetallic compounds, molecular and nonmolecular solids are now known. Among these, the rare earth element seems to play an important role in the synthesis and magnetic properties of the so‐called high‐temperature superconductors. In spite of the efforts made in the developing of a theory that fully explains this amazing phenomenon, there is no consensus among scientists yet. However, this fact has not represented a barrier for the developing of superconducting materials in films, wires, etc. that allows one to use them for many applications. This article is an overview and an introduction to superconductivity and superconducting materials.

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High-temperature superconductivity at 25: Still in suspense

Cited by 43 publications

References 6 publications

Doping as a Possible Means to create Superconductivity in Graphene

Doping as a Possible Means to create Superconductivity in Graphene

Electronic Conductivity

Lanthanides: Superconducting Materials

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