Dielectric Function of La<sub>2</sub>CuO<sub>4</sub>

Vielsack, G.; Baltz, R. v.

doi:10.1002/pssb.2221580124

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…In order to demonstrate selectively the renormalization effect introduced by the Cu 4s orbital for the OBSM not only within the -model approach. we have calculated κκ approximately using for the electronic band structure of the CuO plane an eleven-band model (11BM: based on Cu 3d and O 2p states [51]) and a twelve-band model (12BM) which takes the Cu 4s state into account in addition.…”

Section: Phonon Dispersion Charge Response and Phonon Density Of Statesmentioning

confidence: 99%

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Bauer¹,

Falter²

2010

J. Phys.: Condens. Matter

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Phonon dynamics, charge response and the phonon density of states are calculated for the high-temperature superconductors HgBa(2)CuO(4) and Bi(2)Sr(2)CuO(6) within a microscopic model for the electronic density response. The results are compared with previous calculations for La(2)CuO(4) and Nd(2)CuO(4). Our main focus is on the phonon anomalies which are connected with the high-frequency oxygen bond-stretching modes (OBSM) found before in our calculations for p-doped La(2)CuO(4) and n-doped Nd(2)CuO(4). We investigate the question if the characteristic softening of the OBSM and the related strong coupling to the electrons is also present in HgBa(2)CuO(4) and Bi(2)Sr(2)CuO(6). In particular, the importance of the contribution of the more delocalized Cu 4s state besides the localized Cu 3d state on the softening is investigated and the different anticrossing behavior due to the presence of several phonon modes with the same symmetry as the OBSM is studied. This makes the identification of the anomalies quite complicated. Furthermore, the influence of electronic polarization processes at ions out of the CuO plane in the ionic layers on the phonon dynamics is calculated. In this context the qualitative type of charge response, i.e. the presence or not of possible metallic charge fluctuations at the Hg or Bi ion, respectively, linked via the apex oxygen to the CuO plane, proves to be very sensitive for certain phonon modes. All the calculations are compared to the experimental results available so far. The latter, however, are rather incomplete for the Hg and Bi compounds.

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Section: Phonon Dispersion Charge Response and Phonon Density Of Statesmentioning

confidence: 99%

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Bauer¹,

Falter²

2010

J. Phys.: Condens. Matter

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show abstract

“…In order to demonstrate selectively the renormalization effect introduced by the Cu4s orbital for the OBSM not only within the Π-model approach we have calculated Π κκ ′ approximately using for the electronic band structure of the CuO plane an elevenband-model (11BM: based on Cu3d and O2p states [51]) and a twelve-band-model (12BM) which takes the Cu4s state in addition into account.…”

Section: Phonon Dispersion Charge Response and Phonon Density Of Statesmentioning

confidence: 99%

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Bauer,

Falter

2009

Preprint

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Phonon dynamics, charge response and the phonon density of states are calculated for the high-temperature superconductors HgBa 2 CuO 4 and Bi 2 Sr 2 CuO 6 within a microscopic model for the electronic density response. The results are compared with previous calculations for La 2 CuO 4 and Nd 2 CuO 4 . Our main focus is on the phononanomalies which are connected with the high-frequency oxygen bondstretching modes (OBSM) found before in our calculations for p-doped La 2 CuO 4 and n-doped Nd 2 CuO 4 . We investigate the question if the characteristic softening of the OBSM and the related strong coupling to the electrons is also present in HgBa 2 CuO 4 and Bi 2 Sr 2 CuO 6 . In particular the importance of the contribution of the more delocalized Cu4s state besides the localized Cu3d state on the softening is investigated and the different anticrossing behaviour due to the presence of several phonon modes with the same symmetry as the OBSM is studied. This makes the identification of the anomalies quite complicate. Furthermore, the influence of electronic polarization processes at ions out of the CuO plane in the ionic layers on the phonon dynamics is calculated. In this context the qualitative type of charge response, i.e. the presence or not of possible metallic charge fluctuations at the Hg or Bi ion, respectively, linked via the apex oxygen to the CuO plane, proves to be very sensitive for certain phonon modes. All the calculations are compared to the experimental results available so far. The latter, however, are rather incomplete for the Hg and the Bi compound.

show abstract

“…we have calculated κκ approximately using for the electronic band structure of the CuO plane an eleven-band model (11BM: based on Cu 3d and O 2p states [51]) and a twelve-band model (12BM) which takes the Cu 4s state into account in addition.…”

Section: Phonon Dispersion Charge Response and Phonon Density Of Statesmentioning

confidence: 99%

Mechanical experiments in superfluid helium

Hall

1994

Phys.-Usp.

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Phonon dynamics, charge response and the phonon density of states are calculated for the high-temperature superconductors HgBa 2 CuO 4 and Bi 2 Sr 2 CuO 6 within a microscopic model for the electronic density response. The results are compared with previous calculations for La 2 CuO 4 and Nd 2 CuO 4 . Our main focus is on the phonon anomalies which are connected with the high-frequency oxygen bond-stretching modes (OBSM) found before in our calculations for p-doped La 2 CuO 4 and n-doped Nd 2 CuO 4 . We investigate the question if the characteristic softening of the OBSM and the related strong coupling to the electrons is also present in HgBa 2 CuO 4 and Bi 2 Sr 2 CuO 6 . In particular, the importance of the contribution of the more delocalized Cu 4s state besides the localized Cu 3d state on the softening is investigated and the different anticrossing behavior due to the presence of several phonon modes with the same symmetry as the OBSM is studied. This makes the identification of the anomalies quite complicated. Furthermore, the influence of electronic polarization processes at ions out of the CuO plane in the ionic layers on the phonon dynamics is calculated. In this context the qualitative type of charge response, i.e. the presence or not of possible metallic charge fluctuations at the Hg or Bi ion, respectively, linked via the apex oxygen to the CuO plane, proves to be very sensitive for certain phonon modes. All the calculations are compared to the experimental results available so far. The latter, however, are rather incomplete for the Hg and Bi compounds.

show abstract

Dielectric Function of La₂CuO₄

Cited by 5 publications

References 14 publications

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Mechanical experiments in superfluid helium

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Dielectric Function of La2CuO4

Cited by 5 publications

References 14 publications

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Phonon dispersion and anomalies in one-layer high-temperature superconductors

Mechanical experiments in superfluid helium

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Dielectric Function of La₂CuO₄