Spin-phonon coupling and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>q</mml:mi></mml:math>-dependence of spin excitations and high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>superconductivity from band models

Jarlborg, T.

doi:10.1103/physrevb.79.094530

Cited by 12 publications

(15 citation statements)

References 43 publications

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“…For La along z the values are 0.02 and 17 meV, and the averaged λ for the strongest modes is 0.36. 21 These estimates are of the same order as shown in Table I, but they suggest also that the in-plane movements of the O's can have larger λ.…”

Section: Partial Electron-phonon Coupling Calculationssupporting

confidence: 65%

“…The calculated γ from the bare (low-temperature) DOS is about 70 J m −3 K −2 , which leaves room for a large e-ph coupling constant from phonons and/or spin fluctuations. 21 α is the fraction of efficiently coupled modes, R the static reflectivity (R = 0.22 for 1.55 eV in p polarization arriving at 10…”

Section: Three-temperature Model Simulationsmentioning

confidence: 99%

“…21,24,25 We point out that these kinds of relaxation processes may exist, but are not reachable by diffraction techniques which allow access only to the lattice temperature, and not the electronic one. The importance of spin fluctuations in the bosonic glue function has been determined by static optical spectroscopy, 26 which found them to be relevant in the high-energy excitation region (up to 300 meV), whereas phonons are limited to a lower-energy range (around 50-60 meV).…”

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confidence: 97%

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Temperature-dependent electron-phonon coupling in La2−xSrxCuO4

et al. 2013

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The strength of the electron-phonon coupling parameter and its evolution throughout a solid's phase diagram often determines phenomena such as superconductivity, charge-and spin-density waves. Its experimental determination relies on the ability to distinguish thermally activated phonons from those emitted by conduction band electrons, which can be achieved in an elegant way by ultrafast techniques. Separating the electronic from the out-of-equilibrium lattice subsystems, we probed their re-equilibration by monitoring the transient lattice temperature through femtosecond X-ray diffraction in La2−xSrxCuO4 single crystals with x=0.1 and 0.21. The temperature dependence of the electron-phonon coupling is obtained experimentally and shows similar trends to what is expected from the ab-initio calculated shape of the electronic density-of-states near the Fermi energy. This study evidences the important role of band effects in the electron-lattice interaction in solids, in particular in superconductors.

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Section: Partial Electron-phonon Coupling Calculationssupporting

confidence: 65%

Section: Three-temperature Model Simulationsmentioning

confidence: 99%

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confidence: 97%

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Temperature-dependent electron-phonon coupling in La2−xSrxCuO4

et al. 2013

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“…This coupling makes spin waves stronger if they co-exist with phonons of the correct phase and q vector. 19,20 The light O modes are more efficient to enhance the spin waves than the phonons involving heavier elements. Model calculations where the SPC varies with q lead to a spin excitation spectrum quite like what is observed.…”

Section: Introductionmentioning

confidence: 99%

Bands, spin fluctuations, and traces of Fermi surfaces in angle-resolved photoemission intensities for high-Tccuprates

Jarlborg

2011

Phys. Rev. B

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The band structures of pure and hole doped La 2 CuO 4 with antiferromagnetic (AFM) spin fluctuations are calculated and compared to spectral weights of angle-resolved photoemission spectroscopy (ARPES). It is shown that observations of coexisting Fermi-surface (FS) arcs and closed FS pockets are consistent with modulated AFM spin fluctuations of varying wavelengths. Large variations of strong spin fluctuations make the outer part of the FS break diffuse at low doping. This part of the FS is suppressed at high doping when spin fluctuations are weak. The resulting superimposed spectral weight has features both from FS arcs and closed pockets. A connection between results of ARPES, neutron scattering, and band results for the modulated AFM spin-wave state suggests that spin-phonon coupling is an important mechanism for the properties of the cuprates.

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“…In analogy with phonon displacement amplitudes one can estimate m 2 = k B T /K m as a measure of the amplitude of moment fluctuations. 33 While phonon distortions u always increase with T , in a Fermi liquid framework one expects that magnetic moments m will be quenched at a certain T . 29 This is because of a self-supporting process where m is a function of the exchange splitting ξ .…”

Section: Spin Fluctuationsmentioning

confidence: 99%

Effects of thermal and spin fluctuations on the band structure of purple bronze Li2Mo12O34

2012

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The band structures of ordered and thermally disordered Li 2 Mo 12 O 34 are calculated by use of the ab initio density-functional-theory-linear-muffin-tin (DFT-LMTO) method. The unusual, very one-dimensional band dispersion obtained in previous band calculations is confirmed for the ordered structure, and the overall band structure agrees reasonably well with existing photoemission data. Dispersion and band structure perpendicular to the main dispersive direction are obtained. A temperature-dependent band broadening is calculated from configurations with thermal disorder of the atomic positions within the unit cell. This leads to band broadening of the two bands at the Fermi energy which can become comparable to their energy separation. The bands are particularly sensitive to in-plane movements of Mo sites far from the Li sites, where the density of states (DOS) is highest. The latter fact makes the effect of Li vacancies on the two bands relatively small. Spin-polarized band results for the ordered structure show a surprisingly large exchange enhancement on the high DOS Mo sites. Consequences for spin fluctuations associated with a cell doubling along the conducting direction are discussed.

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Spin-phonon coupling andq-dependence of spin excitations and high-Tcsuperconductivity from band models

Cited by 12 publications

References 43 publications

Temperature-dependent electron-phonon coupling in La2−xSrxCuO4

Temperature-dependent electron-phonon coupling in La2−xSrxCuO4

Bands, spin fluctuations, and traces of Fermi surfaces in angle-resolved photoemission intensities for high-Tccuprates

Effects of thermal and spin fluctuations on the band structure of purple bronze Li2Mo12O34

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