Comparative study of organic metals and high- cuprates

Barišić, S.; Barišić, O. S.

doi:10.1016/j.physb.2008.11.025

Cited by 9 publications

(50 citation statements)

References 32 publications

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“…2 the dispersions of two bands, which will be discussed in more detail below, and illustrate the four steps in the scattering processes described by Eqns (13) and (14). Although both of these processes are formally triple resonant, three resonance conditions can be satisfied simultaneously only for the processes shown on the right-hand side of the figure.…”

Section: Two-phonon Raman Scatteringmentioning

confidence: 99%

“…It should be noticed that the photon-phonon coupling functions Eqn (10) and Eqns (12)- (14) are normalized in the way that in the adiabatic approximation and for phonons whose electron-phonon coupling parameter δ ν (q) is directly related to the variation of some parameter ν in the bare electronic Hamiltonian ( ν ≡ pd in the A 1g channel in the cuprates), the photon-one-phonon coupling function has the form [26] T ph ν,αβ (ω) = imω e 2 ∂σ αβ (ω) ∂ ν (15) σ αβ (ω) is the total optical conductivity tensor. Therefore, the products (1 eV…”

Section: Two-phonon Raman Scatteringmentioning

confidence: 99%

“…In order to support this conclusion, we consider the simplest case in the cuprates corresponding to the weak Cu-O hybridization regime of the Emery three-band model with pd U d and U d treated through the effective spin-dependent site-energy dimerization potential mentioned above. In this case, we calculate the interband optical conductivity σ inter xx (ω) and the coupling functions (12)- (14) for the q ≈ 0 one-phonon Raman scattering and for the q = −q ≈ (0, π/b) two-phonon case. The photon-two-magnon coupling functions are expected to be qualitatively the same as that of the two-phonon case and are not shown here.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

“…Among other low‐energy probes supporting the picture of strong CuO hybridization is phonon Raman scattering of B 1 g symmetry. The rich variety of anomalies observed by this probe8–11 is the direct manifestation of the intraband oxygen–oxygen (O–O) quadrupole charge fluctuations 12–14. The latter fluctuations are large only when the ratio t pd /Δ pd is not too small; otherwise, the intercell charge and spin copper–copper (CuCu) fluctuations are dominant.…”

Section: Introductionmentioning

confidence: 95%

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Resonant two‐magnon Raman scattering in high‐T_c cuprates

Kupčić

2010

J Raman Spectroscopy

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Resonance enhancement of one-phonon, two-phonon, and two-magnon Raman scattering in a general, exactly solvable, multiband model is explained in a way that is in accordance with the general analytical properties of the total optical conductivity tensor. Using this approach, the charge-transfer limit of the Emery three-band model is examined to explain resonance enhancement of the two-magnon Raman spectra of high-T c cuprates, which is found in experiments to be of 3 orders of magnitude. While previous Raman and optical conductivity analyzes of the cuprates, based on the single-band Hubbard model, are found to be consistent with the picture where one hole per one CuO 2 unit is localized on the Cu ion, the present three-band approach allows the study of the opposite, strong copper-oxygen hybridization limit, which is found to be in agreement with the results of nuclear magnetic resonance (NMR) and one-phonon Raman scattering experiments. Copyright

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Section: Two-phonon Raman Scatteringmentioning

confidence: 99%

Section: Two-phonon Raman Scatteringmentioning

confidence: 99%

Section: Comparison With Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Resonant two‐magnon Raman scattering in high‐T_c cuprates

Kupčić

2010

J Raman Spectroscopy

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“…The transition temperatures are always arranged T LT T ≥ T CO > T SO , with T LT T = T CO for x < 1/8. The coupling of SO to CO via a third-order "S 2 C" invariant was proposed previously [29], which accounts for the factor of 2 in the wave-vectors. The principal remaining question is whether the driving mechanism comes from CO or SO.…”

Section: Charge and Spin Order In Lbcomentioning

confidence: 99%

In-Plane Oxygens in High-Temperature Superconducting Cuprates

Nikšić

Kupčić

Sunko

et al. 2013

J Supercond Nov Magn

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The role of the oxygen degree of freedom in the cuprates' superconducting planes is analyzed in detail. Structural and photoemission results are reviewed to show that the most sparse description of the in-plane electronic states requires explicit control of the oxygens. For metallic states, the relative contributions of oxygen and copper vary along the Fermi surface (FS), with the arc metallicity dominantly oxygen-derived. For the magnetic responses, we find that the observed incommensurability arises naturally if one keeps separate the roles of the two sites. For the charge order in LBCO, we propose a scenario, based on magnetic interactions in the plane. We stress the need for further experimental investigations of the evolution of the intracell charge distribution with doping, and for a better theoretical understanding of the large particle-hole-symmetry breaking required for successful phenomenologies, but difficult to reconcile with ab initio calculations.

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