Giant phonon anomalies in the bond-stretching modes in doped BaBiO3: comparison to cuprates manganites and nickelates

Braden, M.; Reichardt, W.; Shiryaev, S. V.; Barilo, S. N.

doi:10.1016/s0921-4534(02)01388-6

Cited by 45 publications

(63 citation statements)

References 22 publications

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“…The frequency softening is even much more pronounced in manganates and bismuthates than in the cuprates [21]. Fig.…”

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 90%

“…-Comparison with other metallic perovskites -The over-screening effects in the bond-stretching dispersion are not a particularity of the superconducting cuprates but are seen in many doped perovskites : nickelates [16,17], manganates [18] and superconducting Ba 1−x K x BiO 3 [19,20,21], the only metallic perovskite compound which does not exhibit the effect is superconducting Sr 2 RuO 4 [22], allthough this material is the best metal. The frequency softening is even much more pronounced in manganates and bismuthates than in the cuprates [21].…”

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

“…In the nickelates, however, the dispersion is nearly sinusoidal. This dispersion may be related to the insulating electronic behavior in nickelates [21,46]. The absolute size of the over-screening effects differs essentially between the systems.…”

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

“…Along the other directions in reciprocal space, the manganates and Ba 1−x K x BiO 3 exhibit over-screening effects which even exceed those occurring along [100]. For instance, the volume breathing mode in Ba 1−x K x BiO 3 is renormalized by 40% compared to the insulating reference material [20,21]. A strong softening in the [110] direction was observed also in the nickelates.…”

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

“…Along the [110] direction a nearly flat dispersion is observed in La 2−x Sr x CuO 4 and in YBa 2 Cu 3 O 7 , which still represents sizeable frequency renormalisation compared to the insulating parent compounds. The strong frequency renormalization of the zone-boundary modes is, however, not a particularity of the superconducting cuprates, but is seen in many doped perovskites : nickelates [16,17], manganates [18] and superconducting Ba 1−x K x BiO 3 [19,20,21], the only metallic perovskite compound which does not exhibit the effect is superconducting Sr 2 RuO 4 [22].…”

Section: Introductionmentioning

confidence: 99%

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Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

et al. 2005

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The dispersion of the high-energy phonon modes in the electron doped high-temperature superconductor Nd1.85Ce0.15CuO4 has been studied by inelastic neutron scattering. The frequencies of phonon modes with Cu-O bond-stretching character drop abruptly when going from the Brillouin zone center along the [100]-direction; this dispersion is qualitatively similar to observations in the hole-doped cuprates. We also find a softening of the bond-stretching modes along the [110]-direction but which is weaker and exhibits a sinusoidal dispersion. The phonon anomalies are discussed in comparison to hole-doped cuprate superconductors and other metallic perovskites.

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“…The frequency softening is even much more pronounced in manganates and bismuthates than in the cuprates [21]. Fig.…”

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 90%

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

Section: Iii2 Phonon Dispersion In [110] Directionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

et al. 2005

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Phonon softening in HgBa ₂ CuO _{4+
δ} observed by inelastic X‐ray scattering

Uchiyama

Baron

Tsutsui

et al. 2004

phys. stat. sol. (c)

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Phonon dispersion of HgBa2CuO 4+δ along the direction close to [100] was measured with using inelastic X-ray scattering. The longitudinal optical Cu-O bond stretching mode shows an anomalous softening at q∼0.3, similar to reports for other high-Tc cuprates, such as YBa2Cu3O 7−δ and La2−xSrxCuO4. This feature indicates a common property in the high-Tc cuprates, independent of lattice distortion and transition temperature.

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Superconductivity in cuprates: Details of electron phonon coupling

Larsson

2009

Int J of Quantum Chemistry

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ABSTRACT:The Bardeen-Cooper-Schrieffer (BCS) model explains superconductivity (SC) as due to correlation between electronic momentum and nuclear momentum (phonons) in a free electron gas. The BCS model lacks chemical specificity, however, since the coupling mechanism is left unspecified. After the discovery of high T C superconductivity in 1986 it was concluded that electron-phonon interactions are insufficient to explain electron pairing. A large part of theoretical research has since been aiming at finding another mechanism that would allow us to consider the superconducting system as a gas of charged free bosons. However, there appears to be no reason to assume free electrons in oxides. In this article the free-electron criterion is therefore replaced by the criterion that a pair of electrons can move freely between sites without resistance, i.e., without activation energy. Electron pair transfer is treated in a many-electron real space approach using standard mixed-valence theories. MottHubbard-U is strictly defined, its dependence on breathing mode coordinates analyzed, and the connection between U and the energy gap for superconductivity clarified. dwave gap anisotropy is found to be consistent with the general atomic level model presented here. Softening of phonon half-breathing modes in inelastic neutron scattering (INS) is connected to mixed-valency. The fundamental vibronic interaction between spin density wave (SDW) and charge density wave (CDW) states leads to a new phase with energy gap and electron pair carriers that can only be the superconducting phase.

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Giant phonon anomalies in the bond-stretching modes in doped BaBiO3: comparison to cuprates manganites and nickelates

Cited by 45 publications

References 22 publications

Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

Phonon softening in HgBa ₂ CuO _{4+
δ} observed by inelastic X‐ray scattering

Superconductivity in cuprates: Details of electron phonon coupling

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Giant phonon anomalies in the bond-stretching modes in doped BaBiO3: comparison to cuprates manganites and nickelates

Cited by 45 publications

References 22 publications

Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

Dispersion of the high-energy phonon modes inNd1.85Ce0.15CuO4

Phonon softening in HgBa 2 CuO 4+ δ observed by inelastic X‐ray scattering

Superconductivity in cuprates: Details of electron phonon coupling

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Phonon softening in HgBa ₂ CuO _{4+
δ} observed by inelastic X‐ray scattering