Two-magnon Raman scattering in (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi m

Sugai, S.; Shamoto, S.; Sato, Masatoshi

doi:10.1103/physrevb.38.6436

Cited by 152 publications

(81 citation statements)

References 14 publications

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“…(2.1), the dependence of T f on x is reproduced quite accurately. Further, since our model with this same ratio of D/J also reproduces the neutron scattering measurements of the spin correlation length [19,28] and the Raman scattering spectra [20], it seems likely that these novel topological excitations of the S = 1 2 quantum AFM do indeed play a role in forming the spin textures of the low-temperature, inhomogeneously doped CuO 2 planes.…”

Section: Discussionmentioning

confidence: 84%

“…[19], and the Raman scattering spectra of Ref. [20], when the interaction strength D ∼ 3 was used. It is gratifying that quantitative aspects of all three experiments seem to be consistent with the spin texture found when the low-temperature doped planes are described by Eq.…”

Section: Numerical Evaluation Of T Fmentioning

confidence: 99%

“…In Ref. [12] it was found that the constant D was required to be 2.5 < D/J < 3.3 in order to explain both the Raman scattering data [20] The method employed in the evaluation of E int is straightforward and involves studying…”

Section: Numerical Evaluation Of T Fmentioning

confidence: 99%

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Theory of coexisting transverse-spin freezing and long-ranged antiferromagnetic order in lightly dopedLa2−x

1994

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We provide an explanation of the spin-freezing transition recently observed by Chou et al. (Phys. Rev. Lett. 71, 2323) in La 2−x Sr x CuO 4 for x < ∼ .02. We propose that topological excitations of the 2D Heisenberg quantum antiferromagnet having non-coplanar transverse components have a pair-interaction energy that qualitatively and quantitatively agrees with the observed values of spin-freezing temperature as a function of doping.

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Section: Discussionmentioning

confidence: 84%

Section: Numerical Evaluation Of T Fmentioning

confidence: 99%

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Theory of coexisting transverse-spin freezing and long-ranged antiferromagnetic order in lightly dopedLa2−x

1994

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“…However, it has been discovered a while ago, that twomagnon excitations (a simultaneous flip of two neighboring spins) can be measured in various materials by Raman scattering [14,15], cuprates being no exception [16,17].…”

Section: Pressure Effect On Phonon and Magnon Excitations And Pressurmentioning

confidence: 99%

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

Struzhkin

Chen

2016

Low Temperature Physics

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The mechanism of high-temperature superconductivity of copper oxides (cuprates) remains unsolved puzzle in condensed matter physics. The cuprates represent extremely complicated system, showing fascinating variety of quantum phenomena and rich phase diagram as a function of doping. In the suggested "superconducting glue" mechanisms, phonon and spin excitations are invoked most frequently, and it appears that only spin excitations cover the energy scale required to justify very high transition temperature T c ~ 165 K (as in mercury-based triple layer cuprates compressed to 30 GPa). It appears that pressure is quite important variable helping to boost the T c record by almost 30 degrees. Pressure may be also considered as a clean tuning parameter, helping to understand the underlying balance of various energy scales and ordered states in cuprates. In this paper, a review of mostly our work on cuprates under pressure will be given, with the emphasis on the interactions between phonon and spin excitations. It appears that there is a strong coupling between superexchange interaction and stretching in-plane oxygen vibrations, which may give rise to a variety of complex phenomena, including the charge-density wave state intertwined with superconductivity and attracting a lot of interest recently. PACS

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“…This is simply a consequence of the fact that the experiments are mostly done with the visible or near ultraviolet lasers, while the gap and the upper Hubbard band states lie in the same range of frequences (roughly between 2 eV and 3 eV ) in the high-T c materials. The experimental cross-sections vary strongly in this range of incident photon frequencies, 10,17,18 and it becomes an issue whether the Loudon-Fleury Hamiltonian is still applicable. Whatever the answer to this question, we still need to have the means of evaluating the variation of the overall scale of the coupling constant α in Eq.…”

Section: 1516mentioning

confidence: 99%

High-Tc Superconductors

Selected Topics in Superconductivity

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Resonant two-magnon Raman scattering in parent compounds of high-T c superconductors. AbstractWe propose a theory of two-magnon Raman scattering from the insulating parent compounds of high-T c superconductors, which contains information not only on magnetism, but also on the electronic properties in these materials. We use spin density wave formalism for the Hubbard model, and study diagrammatically the profile of the two-magnon scattering and its intensity dependence on the incoming photon frequency ω i both for ω i ≪ U and in the resonant regime, in which the energy of the incident photon is close to the gap between conduction and valence bands. In the nonresonant case, we identify the diagrams which contribute to the conventional Loudon-Fleury Hamiltonian. In the resonant regime, where most of the experiments have been done, we find that the dominant contribution to Raman intensity comes from a different diagram, one which allows for a simultaneous vanishing of all three of 1 its denominators (i.e., a triple resonance). We study this diagram in detail and show that the triple resonance, combined with the spin-density-wave dispersion relation for the carriers, explains the unusual features found in the two-magnon profile and in the two-magnon peak intensity dependence on the incoming photon frequency. In particular, our theory predicts a maximum of the two-magnon peak intensity right at the upper edge of the features in the optical data, which has been one of the key experimental puzzles.

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Two-magnon Raman scattering in (La1−xSr

Cited by 152 publications

References 14 publications

Theory of coexisting transverse-spin freezing and long-ranged antiferromagnetic order in lightly dopedLa2−x

Theory of coexisting transverse-spin freezing and long-ranged antiferromagnetic order in lightly dopedLa2−x

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

High-Tc Superconductors

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