Cu-O Bond Length Dependence of Optical Properties in T’-Phase Single Crystals

Arima, T.; Ido, T.; Kikuchi, Kôichi; Koshihara, Shin‐ya; Uchida, S.; Tokura, Y.

doi:10.1007/978-3-642-77154-5_34

Cited by 2 publications

(6 citation statements)

References 3 publications

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“…For cuprates and nickelates, [2][3][4][5][6] it was already known that the dimensionality, which is related to the coordination number of the oxygen atoms for the transition metal ion, should play an important role. To check this possibility, we plotted the dimensionality dependences of the ⌬ p-d values in Fig.…”

Section: A the Ru-o Interband Transitionmentioning

confidence: 99%

Bond-length dependence of charge-transfer excitations and stretch phonon modes in perovskite ruthenates: Evidence of strongp–dhybridization effects

Lee

Noh

et al. 2004

Phys. Rev. B

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We reported the optical conductivity spectra of the Ruddlesden-Popper series ruthenates, i.e., Sr n+1 Ru n O 3n+1 and Ca n+1 Ru n O 3n+1 , where n =1, 2, and ϱ. Among various optical transitions, we investigated two Ru-O related modes, i.e., the charge-transfer excitation and the transverse stretching phonon. We found that their frequency shifts are not much affected by a structural dimensionality, but are closely related to the Ru-O bond length. Through the quantitative analysis of the charge-transfer excitation energy, we could demonstrate that the p -d hybridization should play an important role in determining their electronic structure. In addition, we discussed how the electronic excitation could contribute the lattice dynamics in the metallic ruthenates.

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Section: A the Ru-o Interband Transitionmentioning

confidence: 99%

Bond-length dependence of charge-transfer excitations and stretch phonon modes in perovskite ruthenates: Evidence of strongp–dhybridization effects

Lee

Noh

et al. 2004

Phys. Rev. B

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“…We have not found out an experimental value of the static dielectric constant of LaMnO 3 in the literature. We are grateful to T. Arima and Y. Tokura [16] for sending us the experimental data on the reflectivity spectra of LaMnO 3 measured at room temperature and reported in ref. [15].…”

Section: Description Of Lamno3 System and Shell Model Approximationmentioning

confidence: 99%

“…The room temperature optical conductivity spectrum of LaMnO 3 measured in [15] is shown by solid curve 1 in Figure 5, (a) in the spectral region 0 to 8 eV (reproduced from the original data with a permission of T. Arima and Y. Tokura [15,16]). This spectrum is very similar to that measured by Okimoto et al at T = 9 K [26].…”

Section: A Analysis Of the Optical Conductivity Spectra In Lamno3mentioning

confidence: 99%

“…To estimate the contribution to the experimental optical conductivity of LaMnO 3 crystal, shown by solid curve 1 in Figure 5, (a) from the CT transitions we have analyzed the imaginary part of the dielectric function, ǫ 2 (ν) [15,16]. For this purpose, we presented the ǫ 2 (ν) spectrum, shown by solid curve 1 in Figure 5, (b), by a sum of the first three main bands with Lorentzian lineshapes…”

Section: A Analysis Of the Optical Conductivity Spectra In Lamno3mentioning

confidence: 99%

“…Parameters of the imaginary part of the dielectric function ǫ2[15,16] represented by the sum of Lorentzian shaped bands.…”

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Lattice relaxation and charge-transfer optical transitions due to self-trapped holes in nonstoichiometric LaMnO3 crystal

Kovaleva

Gavartin

Shluger

et al. 2002

J. Exp. Theor. Phys.

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We explore the role of electronic and ionic polarisation energies in the physics of the "colossal" magnetoresistive (CMR) materials. We use the Mott-Littleton approach to evaluate polarisation energies in LaMnO3 lattice associated with holes localized on both Mn 3+ cation and O 2− anion. The full (electronic and ionic) lattice relaxation energy for a hole localized at the O-site is estimated as 2.4 eV which is appreciably greater than that of 0.8 eV for a hole localized at the Mn-site, indicating on the strong electron-phonon interaction in the former case. The ionic relaxation around the localized holes differs for anion and cation holes. That associated with Mn 4+ is approximately isotropic, whereas ionic displacements around O − holes show axial symmetry, the axis being directed towards the apical oxygens.Using a Born-Haber cycle we examine thermal and optical energies of the hole formation associated with electron ionization from Mn 3+ , O 2− and La 3+ ions in LaMnO3 lattice. For these calculations we derive a phenomenological value for the second electron affinity of oxygen in LaMnO3 lattice by matching the optical energies of La 4+ and O − hole formation with maxima of binding energies in the experimental photoemission spectra. The calculated thermal energies predict that the electronic hole is marginally more stable in the Mn 4+ state in LaMnO3 host lattice, but the energy of a hole in the O − state is only higher by a small amount, 0.75 eV, rather suggesting that both possibilities should be treated seriously.We examine the energies of a number of fundamental optical transitions, as well as those involving self-trapped holes of Mn 4+ and O − in LaMnO3 lattice. The reasonable agreement with experiment of our predicted energies, linewidths and oscillator strengths leads us to plausible assignments of the optical bands observed. We deduce that the optical band near 5 eV is associated with O(2p) -Mn(3d) transition of charge-transfer character, whereas the band near 2.3 eV is rather associated with the presence of Mn 4+ and/or O − self-trapped holes in non-stoichiometric LaMnO3 compound. PACS numbers: 75.30.Vn, 71.55.Ht, 78.40.Ha I. INTRODUCTIONThe striking behaviour of the CMR oxides of R 1−x A x MnO 3 (R: trivalent rare-earth ions, A: divalent alkaline-earth ions, 0.2 ≤ x ≤ 0.5) arises from the interplay of several distinct energy terms: magnetic interactions, electronic band structure energies, crystal field splittings, vibrational energies and electron lattice coupling, including small polaron ideas and the Jahn-Teller (JT) effect. Understanding this behaviour has been helped very greatly by the use of models to map the various regimes of behaviour [1]. The experimental evidence [2] suggests that manganites are doped charge-transfer insulators having O(2p) holes as the current carriers rather than Mn 3+ (3d) electrons. However, whether holes reside on O-and/or Mn-sites is still the subject of controversy. Some of the models of polarisation and vibration in CMR systems make major approximations, such as a s...

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Cu-O Bond Length Dependence of Optical Properties in T’-Phase Single Crystals

Cited by 2 publications

References 3 publications

Bond-length dependence of charge-transfer excitations and stretch phonon modes in perovskite ruthenates: Evidence of strongp–dhybridization effects

Bond-length dependence of charge-transfer excitations and stretch phonon modes in perovskite ruthenates: Evidence of strongp–dhybridization effects

Lattice relaxation and charge-transfer optical transitions due to self-trapped holes in nonstoichiometric LaMnO3 crystal

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