High-Temperature Superconductivity in Cuprates

Mourachkine, A.

doi:10.1007/0-306-48063-8

Cited by 78 publications

(186 citation statements)

References 2 publications

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“…The local density of charge along the diagonal direction alternates in magnitude leading to this order naturally. For the overdoped case n > n o, this charge-stripe order disappears in conformity with the experimental observations [22]. The optimum doping concentration and the phase diagram are strong functions of values of the parameters.…”

Section: Mutual Influence Of Pseudogap and Superconductivitysupporting

confidence: 87%

Pseudogap and its influence on normal and superconducting states of cuprates

Chaudhuri¹,

Taraphder²,

Ghatak³

2001

Physica C: Superconductivity

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A model incorporating simultaneous superconducting and lattice instabilities has been studied in detail to estimate the nature of coupling and inter-play between them. The phase diagram is obtained in the temperature-filling plane at different values of the parameters of the model. It is found that a pseudogap develops in the distorted phase that inhibits the appearance of the superconducting transition. The superconducting instability is strongest for the regime of filling where the van Hove singularity in the 2D density of states is close to the chemical potential. The pseudogap, developed in the distorted phase, is a function of temperature via the temperature dependence of the distortion itself. Transport properties, namely resistivity and thermopower are found to be strongly dependent on the variations of the pseudogap.

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Section: Mutual Influence Of Pseudogap and Superconductivitysupporting

confidence: 87%

Pseudogap and its influence on normal and superconducting states of cuprates

Chaudhuri¹,

Taraphder²,

Ghatak³

2001

Physica C: Superconductivity

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“…46 In order to obtain a discrete version of the free energy functional, we integrate the free energy density ͑17͒ over volume to yield the free energy…”

Section: ͑21͒mentioning

confidence: 99%

Single-particle density of states of a superconductor with a spatially varying gap and phase fluctuations

Valdez-Balderas

Stroud

2006

Phys. Rev. B

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Recent experiments have shown that the superconducting energy gap in some cuprates is spatially inhomogeneous. Motivated by these experiments, and using exact diagonalization of a model d-wave Hamiltonian, combined with Monte Carlo simulations of a Ginzburg-Landau free energy functional, we have calculated the single-particle local density of states LDOS ͑ , r͒ of a model high-T c superconductor as a function of temperature. Our calculations include both quenched disorder in the pairing potential and thermal fluctuations in both phase and amplitude of the superconducting gap. Most of our calculations assume two types of superconducting regions: ␣ with a small gap and large superfluid density, and ␤ with the opposite. If the ␤ regions are randomly embedded in an ␣ host, the LDOS on the ␣ sites still has a sharp coherence peak at T = 0, but the ␤ component does not, in agreement with experiment. An ordered arrangement of ␤ regions leads to oscillations in the LDOS as a function of energy. The model leads to a superconducting transition temperature T c well below the pseudogap temperature T c0 and has a spatially varying gap at very low T, both consistent with experiments in underdoped Bi2212. Our calculated LDOS ͑ , r͒ shows coherence peaks for T Ͻ T c , which disappear for T Ͼ T c , in agreement with previous work considering phase but not amplitude fluctuations in a homogeneous superconductor. Well above T c , the gap in the LDOS disappears.

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“…The coupling constant of this exchange potential was assumed to be negative. The Hamiltonian (2.1) can be substantiated by the existence of strong local interactions between phonons and electrons in some materials [10,11,14]. Such interactions lead to forming polarons which in turn can attract each other.…”

Section: The Modelmentioning

confidence: 99%

“…For example, a mixed mechanism of superconductivity in the new materials was considered. This concept joined the strong coupling between phonons and electrons with the spin fluctuations idea [11].…”

Section: Introductionmentioning

confidence: 99%

“…One of arguments for this could be the presence of the untypical isotope effect pointing to the relevance of the phonon-electron interactions in new materials. As is known these materials display strong coupling between phonons and electrons because they are very bad conductors in the normal state and antiferromagnetic Mott insulators when undoped [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On Some Factors Affecting the Critical Temperature in a Two-Band Model of Superconductivity

Tarasewicz

2013

J Supercond Nov Magn

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The influence of a few factors on the critical temperature in a two-band superconducting system is investigated. The system contains conventional Cooper pairs from a wider band (the d-band) as well as local pairs (local bipolarons) from a narrower band (the f-band), which are induced via a pair-exchange potential. These factors are the Coulomb repulsion between f-electrons, the position of the f-band with respect to the bottom of the d-band and two kinds of hopping in the f-band: a single-polaron hopping and a pair hopping. The Coulomb potential turns out to lower the critical temperature from higher values to the pure BCS one. Each of the kinds of hopping is treated by making use of perturbation theory. Pair hopping is incorporated as the first order correction but the hopping of single polarons enters as the second order one. Each of them increases this temperature on its own, however, the hopping of single polarons makes it stronger. The position of the f-band that corresponds to the site energy of a f-electron poses a very interesting case. There appear two peaks at two values of that energy meaning a rapid increase of the critical temperature due to the strong effect of the presence of local electron pairs. In this case one has to do with a purely chemical mechanism of the increase of the critical temperature.

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High-Temperature Superconductivity in Cuprates

Cited by 78 publications

References 2 publications

Pseudogap and its influence on normal and superconducting states of cuprates

Pseudogap and its influence on normal and superconducting states of cuprates

Single-particle density of states of a superconductor with a spatially varying gap and phase fluctuations

On Some Factors Affecting the Critical Temperature in a Two-Band Model of Superconductivity

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