High-temperature superconductivity: the current state

Maksimov, Evgenii G.

doi:10.1070/pu2000v043n10abeh000770

Cited by 103 publications

(38 citation statements)

References 156 publications

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“…Eq. (21) shows that the direct contribution of the superconducting gap to the dynamical conductivity and, therefore, to the optical sum rules has the same smallness for any mechanism of superconductivity, that is (∆/ω) 2 . This smallness is, certainly, different for conventional superconductors and high-T c ones because the gap in the later is one order larger.…”

Section: It Leads Tomentioning

confidence: 99%

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Electromagnetic response of superconductors and optical sum rule

Karakozov

Maksimov

Dolgov

2002

Solid State Communications

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The interrelation between the condensation energy and the optical sum rules has been investigated. It has been shown that the so called 'partial' sum rule violation is related mainly to a temperature dependence of the relaxation rate rather than to the appearance of superconductivity itself. Moreover, we demonstrate that the experimental data on the temperature dependence of the optical sum rule can be explained rather well by an account of strong electron-phonon interaction.Many recently published works are concerned with the origin of the condensation energy of the superconducting state, a possible violation of so-called 'optical sum rules', and the relation between these phenomena. These papers include both theoretical investigations [1][2][3][4][5][6] of these problems and experimental attempts 7-10 to observe a violation of the optical sum rule. Usually, the possibility of such violation is related to the change of the kinetic en-

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Section: It Leads Tomentioning

confidence: 99%

“…For the numerical calculations we have employed the Eliashberg function from our preceding papers 20,21 and use the general expression for the conductivity (24) , rather than approximate Eq. (25).…”

Section: It Leads Tomentioning

confidence: 99%

Electromagnetic response of superconductors and optical sum rule

Karakozov

Maksimov

Dolgov

2002

Solid State Communications

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“…Many groups have used a finite-temperature version of this result [367,383]. In many inversion schemes, DOS is approximated by a constant, and in this case Eq.…”

Section: Optical Extraction Techniquesmentioning

confidence: 99%

Intermediate coupling model of the cuprates

Das

Markiewicz

Bansil

2014

Advances in Physics

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We review the intermediate coupling model for treating electronic correlations in the cuprates. Spectral signatures of the intermediate coupling scenario are identified and used to adduce that the cuprates fall in the intermediate rather than the weak or the strong coupling limits. A robust, 'beyond LDA' framework for obtaining wide-ranging properties of the cuprates via a GW-approximation based self-consistent self-energy correction for incorporating correlation effects is delineated. In this way, doping and temperature dependent spectra, from the undoped insulator to the overdoped metal, in the normal as well as the superconducting state, with features of both weak and strong coupling can be modeled in a material-specific manner with very few parameters. Efficacy of the model is shown by considering available spectroscopic data on electron and hole doped cuprates from angle-resolved photoemission (ARPES), scanning tunneling microscopy/spectroscopy (STM/STS), neutron scattering, inelastic light scattering, optical and other experiments. Generalizations to treat systems with multiple correlated bands such as the heavy-fermions, the ruthenates, and the actinides are discussed.

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“…There is a growing evidence that, in addition to the common electron-phonon (e-ph) interaction [17], it is of presumably magnetic type [5,16], and all members of the iron arsenide RF eAsO 1−x F x family are characterized by the long-range (non-local) magnetic correlations [18]. It is well known that upon electron or hole doping with F substitution at the O site [1,19,20] or with oxygen vacancies [21,22], all properties of the parent RFeAsO compounds drastically change and evident AF order has to disappear [2].…”

Section: Introductionmentioning

confidence: 99%