Is the pseudogap in the high Tc cuprates evidence for dynamic van Hove Jahn-Teller effects?

Markiewicz, R. S.

doi:10.1007/bf00727430

J Supercond

1995

DOI: 10.1007/bf00727430

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Is the pseudogap in the high Tc cuprates evidence for dynamic van Hove Jahn-Teller effects?

R. S. Markiewicz

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Cited by 5 publications

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“…The unique van Hove singularity of the tetragonal phase is splitted into two singularities with the Fermi level lying between them, in a region where the density of states is low. The low temperature tetragonal (LTT) phase behaves like a static JT phase, in which the tilting of the CuO 6 splits the VHS degeneracy [4,61,62] and simultaneously destroys superconductivity [63]. In a static low temperature orthorhombic (LTO) distortion, the octahedra tilt in such a way as to preserve the VHS degeneracy [4,63].…”

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“…The low temperature tetragonal (LTT) phase behaves like a static JT phase, in which the tilting of the CuO 6 splits the VHS degeneracy [4,61,62] and simultaneously destroys superconductivity [63]. In a static low temperature orthorhombic (LTO) distortion, the octahedra tilt in such a way as to preserve the VHS degeneracy [4,63]. It has been shown that low temperature tetragonal (LTT) and high temperature tetragonal (HTT) phases can be interpreted as dynamic Jahn-Teller (JT) phases [4,63,64].…”

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confidence: 99%

“…In a static low temperature orthorhombic (LTO) distortion, the octahedra tilt in such a way as to preserve the VHS degeneracy [4,63]. It has been shown that low temperature tetragonal (LTT) and high temperature tetragonal (HTT) phases can be interpreted as dynamic Jahn-Teller (JT) phases [4,63,64].…”

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confidence: 99%

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Fundamental Properties and Origin of the High-Tc Cuprate Superconductors: Development of Concepts

Bechlaghem¹

2014

Int. J. Adv. App. Phy. Res.

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After a review of the fundamental properties of the high-Tc cuprate superconductors, we evaluate and study the major parameters of these compounds. In this approach, we consider the attractive interaction is due to the phonons at low temperature, but at high temperature it is related to the magnetic excitations. Analytical expressions for the coherence length , the isotope coefficient and the superconducting gap ratio R = 2 (0) /k B T c are obtained for the case where the Fermi level is close to the van Hove singularity. This model explains simultaneously high Tc, large gap energy (0), short coherence length and small values of the isotope coefficient. Our theoretical values are in a good agreement with experimental results.

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Fundamental Properties and Origin of the High-Tc Cuprate Superconductors: Development of Concepts

Bechlaghem¹

2014

Int. J. Adv. App. Phy. Res.

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“…Many authors have treated JT (or PJT) effect in doped cuprates in a rather general and various form both as a source of the local pairing [20] and as a source of the unconventional physical properties [21][22][23][24]. So, H. Kamimura [22] proposed a mechanism of the HTSC due to the coherent bipolaron conduction induced by JT distortions.…”

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“…A dynamic Van Hove Jahn-Teller effect has been introduced by R.S. Markiewicz [23]. The essence of the vibronic model by M. Georgiev et al, L. Mihailov et al [24] is existence of off-centered apex oxygens as local polarizable states due to PJT effect.…”

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Singlet-triplet pseudo Jahn-Teller centers in copper oxides

Moskvin¹,

Panov²

1998

Phys. Solid State

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One of the most exciting features of the hole centers CuO 5− 4 in doped cuprates is an unusually complicated ground state which is the result of the electronic quasi-degeneracy. An additional hole, doped to the basic CuO 6− 4The Jahn-Teller hole centers like CuO 5− 4 with singlet-triplet quasi-degeneracy within ground state have been observed by ESR spectroscopy in LaSrAl 1−x Cu x O 4 which is isostructural to La 2−x Sr x CuO 4 [5]. Moreover, Yu. Yablokov et al. [6] conjectured that doped hole in the copper-oxygen clusters occupies a purely oxygen a 2g (π), or b 2u (π) like orbitals. An important indication to the O2p(π) nature of doped holes and, hence, to the occurrence of near-degeneracy for configurations like b 2 1g and b 1g e u (π) was obtained by Yoshinari [7] and Martindale et al. [8] after the analysis of the 17 O Knight shift data and temperature-dependent anisotropy of the planar oxygen nuclear spinlattice relaxation rate in Y Ba 2 Cu 3 O 6+x , respectively. Analogous conclusion could be drawn out of the comparative analysis of the temperature behavior for the nuclear spin-lattice relaxation rate in La 2−x Sr x CuO 4 [9]. All this implies a complicated nature of the ground state manifold for the CuO 4 center with a significant mixing of the Zhang-Rice singlet and some other molecular term, which symmetry should be distinct from 1 A 1g . This conclusion conflicts with the widespread opinion regarding the well isolation of the Zhang-Rice singlet.An important argument in favor of vibronic nature for ground state of CuO 4 clusters with the participation of e uorbitals in the 123 system was obtained after analysis of experimental data on EFG (electric field gradient) tensor for different nuclei in 123 system [10]: non-contradictory description of the data implies a considerable (10%!) difference in electron density for O(2) and O(3) oxygens. It is unlikely that this result could be obtained without PJT effect.These and many other results of resonance (ESR, NQR/NMR) experiments being precise local probes cast doubt on the validity of popular conceptions which are widely used as a starting point for the analysis of resonance and in broader sense for many other physical effects in cuprates.A considerable number of the experimental indications of Jahn-Teller (vibronic) effects is associated with observation of lattice instabilities, ferroelectric [11], pyro-and piezoelectric [12] anomalies, local static and dynamic distortions [13], various phonon anomalies and manifestation of substantial electron-phonon effects such as the line shift and Fano effect for the phonon modes associated with local PJT-active modes [14][15][16]. These observations and many other lattice effects are signatures of unconventional strong electron-lattice interaction at work in the cuprates [13] with highly nonlinear and nonadiabatic intrinsic dynamics. Up to now these phenomena are often considered as convincing evidence in favour of the "structural" scenario for the high-T c superconductivity usually associated with polarons (pseu...

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The singlet-triplet pseudo-Jahn–Teller centers in copper oxides

Moskvin¹,

Panov²

1999

Journal of Physics and Chemistry of Solids

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Is the pseudogap in the high Tc cuprates evidence for dynamic van Hove Jahn-Teller effects?

Cited by 5 publications

References 36 publications

Fundamental Properties and Origin of the High-Tc Cuprate Superconductors: Development of Concepts

Fundamental Properties and Origin of the High-Tc Cuprate Superconductors: Development of Concepts

Singlet-triplet pseudo Jahn-Teller centers in copper oxides

The singlet-triplet pseudo-Jahn–Teller centers in copper oxides

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