Essential Role of the Lattice in the Mechanism of High Temperature Superconductivity

Egami, T.

doi:10.1007/978-3-540-71023-3_8

Cited by 4 publications

(2 citation statements)

References 90 publications

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“…Far from or near T C , lattice deformations, tetragonal-to-orthorhombic phase transformations, deformation of the orthorhombic phase, even martensitic phase transformations, have been observed in the cuprates in function of temperature, doping, substitution, or under strain [27,[53][54][55][56][57]. This leads to a competition between electronic and elastic energies.…”

Section: Evidence Of Lattice Involvementmentioning

confidence: 95%

Superconductivity and the Van Hove Scenario

Bok

Bouvier

2012

J Supercond Nov Magn

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We give a review of the role of the Van Hove singularities in superconductivity. Van Hove singularities (VHs) are a general feature of low-dimensional systems. They appear as divergences of the electronic density of states (DOS). Jacques Friedel and Jacques Labbé were the first to propose this scenario for the A15 compounds. In NbTi, for example, Nb chains give a quasi-1D electronic structure for the d-band, leading to a VHs. They developed this model and explained the high T C and the many structural transformations occurring in these compounds. This model was later applied by Jacques Labbé and Julien Bok to the cuprates and developed by Jacqueline Bouvier and Julien Bok. The high T C superconductors cuprates are quasibidimensional (2D) and thus lead to the existence of Van Hove singularities in the band structure. The presence of VHs near the Fermi level in the cuprates is now well established. In this context we show that many physical properties of these materials can be explained, in particular the high critical temperature T C , the anomalous isotope effect, the superconducting gap and its anisotropy, and the marginal Fermi liquid properties, they studied these properties in the optimum and overdoped regime. These compounds present a topological transition for a critical hole doping p ≈ 0.21 hole per CuO 2 plane.

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Section: Evidence Of Lattice Involvementmentioning

confidence: 95%

Superconductivity and the Van Hove Scenario

Bok

Bouvier

2012

J Supercond Nov Magn

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“…The situation is more favorable in the cuprates, which are almost bidimensional and where the VHs lies near the middle of the band. Far or near T C , lattice deformations tetragonal to orthorhombic phase transformations, deformation of the orthorhombic phase, even martensitic phase transformations, have been observed in the cuprates in function of temperature, doping, substitution, or under strained [11,[44][45][46][47][48]. This leads to a competition between electronic and elastic energies.…”

Section: Evidence Of Lattice Involvementmentioning

confidence: 99%

Electron-Phonon Interaction in the High- Cuprates in the Framework of the Van Hove Scenario

Bouvier

Bok

2010

Advances in Condensed Matter Physics

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Electron-lattice interaction was the original idea of Müller and Berdnorz who chose copper oxides, because of the strong Jahn-Teller effect of the Cu ion leading to the formation of bipolarons. Later several experimental features led to theoretical models based on strong electronic correlations. The high- superconductors cuprates are quasi-bidimensional (2D) and thus lead to the existence of Van Hove singularities (VHs) in the band structure, that is, a peak in the electronic density of states. The presence of VHs near the Fermi-level in the cuprates is now well established. In this context we show that many physical properties of these materials can be explained using electron-phonon interaction, in particular the high critical temperature , the anomalous isotope effect, the superconducting gap and its anisotropy, and the marginal Fermi-liquid properties. These compounds present a topological transition for a critical hole doping hole per plane.

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Alex and the Origin of High-Temperature Superconductivity

Egami

2017

Springer Series in Materials Science

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Essential Role of the Lattice in the Mechanism of High Temperature Superconductivity

Cited by 4 publications

References 90 publications

Superconductivity and the Van Hove Scenario

Superconductivity and the Van Hove Scenario

Electron-Phonon Interaction in the High- Cuprates in the Framework of the Van Hove Scenario

Alex and the Origin of High-Temperature Superconductivity

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