Model for an Exciton Mechanism of Superconductivity

Allender, David W.; Bray, J. W.; Bardeen, John

doi:10.1103/physrevb.7.1020

Cited by 482 publications

(148 citation statements)

References 11 publications

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“…The high pressure work on Ca122 has demonstrated that a strain-induced metastable filamentary or intergrain superconducting phase can exist in Ca122 under pressure (26,27). It has also been shown that interfacial or filamentary superconductivity can have an enhanced T c (28). The present experiment may have shown such a possibility, perhaps chemicaland/or strain-induced.…”

Section: Resultsmentioning

confidence: 62%

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Deng

Gooch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

127

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We report the detection of unusual superconductivity up to 49 K in single crystalline CaFe 2 As 2 via electron-doping by partial replacement of Ca by rare-earth. The superconducting transition observed suggests the possible existence of two phases: one starting at 49 K, which has a low critical field < 4 Oe, and the other at 21 K, with a much higher critical field > 5 T. Our observations are in strong contrast to previous reports of doping or pressurizing layered compounds AeFe 2 As 2 (or Ae122), where Ae = Ca, Sr, or Ba. In Ae122, hole-doping has been previously observed to generate superconductivity with a transition temperature ( T c ) only up to 38 K and pressurization has been reported to produce superconductivity with a T c up to 30 K. The unusual 49 K phase detected will be discussed.

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Section: Resultsmentioning

confidence: 62%

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Deng

Gooch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

127

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“…The heterogeneous nature of these and higher Tc materials at the atomic level seems tailored for the Allender, Bray and Bardeen [96] exciton mechanism: metal-dielectric-metal ....... This raises the question as to whether a similar mechanism is disguised in the BaBiO3-bases superconductors.…”

Section: Final Remarksmentioning

confidence: 99%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

119

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We review the crystal chemical, electronic, magnetic and superconducting properties of La2CuO4 and related planar-cuprate materials, with emphasis on single-crystal results. Although magnetism due to divalent copper ions clearly is evident in nonsuperconducting crystals, experiments do not reveal any direct relationship between localized copper spins and high temperature superconductivity. We also indicate areas where important information is lacking for our understanding of these materials.

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“…Near the interface, on the pairing side, the density of states can be much enhanced [12,13]. Besides, large attractive interactions between electrons of the surface sheet can be mediated by excitations coming from the unscreened (or poorly screened) bulk region; for instance, these can be excitonic [14] or driven by polarization effects [15,16,17]. This is shown in Fig.…”

Section: Introductionmentioning

confidence: 98%

Interface superconductivity

Gariglio

Gabay

Mannhart

et al. 2015

Physica C: Superconductivity and its Applications

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Low dimensional superconducting systems have been the subject of numerous studies for many years. In this article, we focus our attention on interfacial superconductivity, a field that has been boosted by the discovery of superconductivity at the interface between the two band insulators LaAlO 3 and SrTiO 3 .We explore the properties of this amazing system that allows the electric field control and on/off switching of superconductivity. We discuss the similarities and differences between bulk doped SrTiO 3 and the interface system and the possible role of the interfacially induced Rashba type spin-orbit. We also, more briefly, discuss interface superconductivity in cuprates, in electrical double layer transistor field effect experiments, and the recent observation of a high T c in a monolayer of FeSe deposited on SrTiO 3 .

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Model for an Exciton Mechanism of Superconductivity

Cited by 482 publications

References 11 publications

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Properties of La2CuO4 and related compounds

Interface superconductivity

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Model for an Exciton Mechanism of Superconductivity

Cited by 482 publications

References 11 publications

Unusual superconducting state at 49 K in electron-doped CaFe 2 As 2 at ambient pressure

Unusual superconducting state at 49 K in electron-doped CaFe 2 As 2 at ambient pressure

Properties of La2CuO4 and related compounds

Interface superconductivity

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Product

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Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure