Incommensurate SDW in cuprates

Nikšić, Goran; Kupčić, Ivan; Sunko, D. K.; Barišić, S.

doi:10.1016/j.physb.2012.01.033

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…We have previously connected the peakrotation and "arc-protection" effects [26]. Here we present a simple qualitative mechanism, by which the complexity of the cuprates can give rise to an incommensurate magnetic response already at low order, one-loop level.…”

Section: Magnetic Responsesmentioning

confidence: 79%

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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Section: Magnetic Responsesmentioning

confidence: 79%

In-Plane Oxygens in High-Temperature Superconducting Cuprates

Nikšić

Kupčić

Sunko

et al. 2013

J Supercond Nov Magn

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“…46 considering the Tdependent multi-component uniform magnetic susceptibility, and supported by recent observations [39] for x > 0. SL consists of spin/charge separated states in which only spin-flips are possibly traveling in presence of kinematical two-particle (four leg) interactions such as p − p repulsion [10,47], b − b super-exchange and RKKY, and mixed f − b interaction [10]. In particular, the mixed f − p vertex couples the spin-flips on Cu-and O-sites.…”

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confidence: 99%

Itinerant and high-energy localized single-particle spectra in large-U$_d$ high-Tc cuprates

Barišić,

Barišić

2013

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A theory of the underlying metallic state of large-U d high-T c cuprates is presented starting from the covalent Cu-2O 3-band model associated with a sufficiently small copper occupancy. U d = ∞ is dealt by the slave fermion approach. Diagrammatic low order NCA theory in terms of the Cu-O hopping is supplemented with two independent slave particle chemical potentials which implement the U(1) local gauge invariance "at average", thus avoiding the mean-field approximations. The resulting hole spectra consist of itinerant and localized states. The itinerant states close to the Fermi level are coherent. They exhibit dichotomies, the copper/oxygen in real and the nodal/antinodal in reciprocal space. The localized states, related to random Cu-O "mixed valence" fluctuations within the CuO 2 unit cells, are incoherent and fall well away from the Fermi level. Consequently, Luttinger's band sum rule for the conduction band is broken. Comparison with IPES, ARPES and NQR data on NCCO, LSCO, Bi2201 and Bi2212 -in order of increasing correlations -leads to remarkable agreements considering that only three bare band parameters are involved.

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