Generalized Coulomb pairing in the condensed state

Moulopoulos, Konstantinos; Ashcroft, N. W.

doi:10.1103/physrevlett.66.2915

Cited by 46 publications

(29 citation statements)

References 10 publications

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“…There are known to be four insulating molecular solid phases, an insulating molecular liquid phase, and a conducting atomic liquid phase at high temperatures 2 . Most interestingly, theory predicts the existence of a low-temperature metallic phase above 350 GPa, which could be a superconductor with an unusually high T c or even something more exotic [3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Benchmarking exchange-correlation functionals for hydrogen at high pressures using quantum Monte Carlo

et al. 2014

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The ab-initio phase diagram of dense hydrogen is very sensitive to errors in the treatment of electronic correlation. Recently, it has been shown that the choice of the density functional has a large effect on the predicted location of both the liquid-liquid phase transition and the solid insulator-to-metal transition in dense hydrogen. To identify the most accurate functional for dense hydrogen applications, we systematically benchmark some of the most commonly used functionals using Quantum Monte Carlo. By considering several measures of functional accuracy, we conclude that the van der Waals and hybrid functionals significantly out perform LDA and PBE. We support these conclusions by analyzing the impact of functional choice on structural optimization in the molecular solid, and on the location of the liquid-liquid phase transition.

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Section: Introductionmentioning

confidence: 99%

Benchmarking exchange-correlation functionals for hydrogen at high pressures using quantum Monte Carlo

et al. 2014

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“…[40,41] The effect was observed by measuring the magnetic field (London) penetration depth l H of isotope-substituted copper oxides. The carrier density is unchanged with the isotope substitution of 16 O by 18 O, and the isotope effect on l H measures directly the isotope effect on the carrier mass m ** . A carrier mass isotope exponent a m = dlnm ** /dlnM was observed, [41] as predicted by the bipolaron theory.…”

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confidence: 99%

“…[18] Such a system can be viewed as a dual condensed matter of vortices exhibiting a phase transition from a BCS superconductor to a neutral superfluid driven by a magnetic field. [19] …”

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confidence: 99%

The Possibility of a Liquid Superconductor

et al. 2006

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All superconductors are solids in their superconducting state, this canonical electronic state of matter presently having only been observed well below the melting temperature of the solid. The discovery of high-temperature superconductivity in cuprates has widened significantly our horizons of the theoretical understanding of the physical phenomenon. A number of observations point to the possibility that superconductors with a high superconducting transition temperature may not be conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, but rather derive from the Bose-Einstein condensation of real-space pairs. While BCS superconductors exist in the solid state (probably with the exception of metallic liquid hydrogen at ultrahigh pressures), we argue here that a superconducting charged Bose liquid may be found in a true liquid state of condensed matter at ambient pressure. An experimental scenario is outlined in fluid metal-ammonia solutions for stabilizing and observing a high-temperature superconducting liquid (ca. 230 K) or at least a vitreous superconductor in the corresponding quenched solutions (ca. 160 K).

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“…when the De Broglie wavelength λ DB approaches the mean distance between the bosons. For a gas of particles with mass m and a thermal kinetic energy distribution, λ DB is given by [17]: equal sign [18,19], a modification of BCS theory in terms of a particle-hole channel [20], or the substantial work that has been performed on electron-proton coupling in metallic hydrogen [21] The possibility of current flow due to the combined electron and hole transport can also be viewed differently. The concept of a holelike quasiparticle originates from the situation in which an electron is removed from the top of an otherwise full semiconductor valence band.…”

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confidence: 99%

Electron-hole coupling in high-Tc cuprate superconductors

Brinkman

Hilgenkamp

2005

Physica C: Superconductivity

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From recent Hall effect measurements and angle-resolved photo-emission spectroscopy the interesting picture emerges of co-existing hole-and electron-like quasiparticle bands, both in electron-and hole-doped superconducting cuprates. We reflect on the idea that bosonic electron-hole pairs may be formed in the cuprates and on the possibility that these pairs undergo Bose-Einstein condensation. The relevance to high-T c superconductivity in the cuprates will be discussed. [4,5]. The latter category is formed by the materials Ln 2-x Ce x CuO 4 , with Ln = La, Nd, Pr, Eu, or Sm [6]. In line with the classical BCS concepts, the superconductivity in these materials is considered to result from pairing of two holes into Cooperpairs with a charge of 2e for the p-type compounds and of two electrons into pairs of -2e charge for the n-type materials. The formation of bosonic pairs of two coupled fermionic particles has indeed been evidenced in the high-T c cuprates from the quantization of magnetic flux in a superconducting ring in units of the flux quantum Φ 0 = h/2e [7]. The mechanism of the pair formation in the high-T c cuprates is however still elusive and one of the unresolved questions is whether the mechanism depends principally on the sign of the charges constituting the pairs.

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Generalized Coulomb pairing in the condensed state

Cited by 46 publications

References 10 publications

Benchmarking exchange-correlation functionals for hydrogen at high pressures using quantum Monte Carlo

Benchmarking exchange-correlation functionals for hydrogen at high pressures using quantum Monte Carlo

The Possibility of a Liquid Superconductor

Electron-hole coupling in high-Tc cuprate superconductors

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