Normal modes of tetragonal La2NiO4 and La2CuO4, isomorphs of the hight Tc superconductor La2-xSrxCuO4

Bates, Frances E.; Eldridge, J. E.

doi:10.1016/0038-1098(89)90520-6

Cited by 32 publications

(13 citation statements)

References 21 publications

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“…This peak includes the double degenerate E 2u bending mode of the in-plane Ni-O bond, and the A 2u mode which displaces the 4 basal oxygens relative to the Ni atom and to both apical oxygens. Those two phonons, observed by neutron scattering in La 2 NiO 4at 347 and 346 cm −1 , respectively,[19] are quasi-degenerate due to the high symmetry of the oxygen octahedron which surrounds the Ni atom [20]. Any distortion of the oxygen square, as…”

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confidence: 98%

Infrared response of ordered polarons in layered perovskites

et al. 1996

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We report on the infrared absorption spectra of three oxides where charged superlattices have been recently observed in diffraction experiments. In La 1.67 Sr 0.33 NiO 4 , polaron localization is found to suppress the low-energy conductivity through the opening of a gap and to split the E 2u -A 2u vibrational manifold of the oxygen octahedra. Similar effects are detected in Sr 1.5 La 0.5 MnO 4 and in La 2 NiO 4+y , with peculiar differences related to the type of charge ordering. 71.38.+i, 72.10Di, 78.20.Dj Typeset using REVT E X 1

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confidence: 98%

Infrared response of ordered polarons in layered perovskites

et al. 1996

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“…In this geometry A 1g lines are allowed. First of them at around 230 cm -1 was assigned to the La stretching mode [28][29][30][31]. The second one at around 450 cm -1 was identified as the oxygen stretching mode [28][29][30][31].…”

Section: Resultsmentioning

confidence: 99%

“…First of them at around 230 cm -1 was assigned to the La stretching mode [28][29][30][31]. The second one at around 450 cm -1 was identified as the oxygen stretching mode [28][29][30][31]. Above the charge ordering temperature all the observed modes are weak; the 230 and especially 450 cm -1 modes are broad, indicating strong polaronic effects and inhomogeneous charge distribution [23,32].…”

Section: Resultsmentioning

confidence: 99%

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

Gnezdilov

Kurnosov

Yeremenko

et al. 2005

Low Temperature Physics

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Electronic correlation effects in La 2-x Sr x NiO 4 (x = 1/3 and 0.225) lead to spontaneous phase separation into microscopic spin/charge stripes with commensurate and incommensurate order, respectively. Raman scattering experiments on such single crystalline materials show a rich phenomenology of phonon and magnon anomalies due to the new, self-organized periodicities. These effects are observable as function of temperature but can also be induced by cooling in a seemingly small magnetic field leading to a reorganization of stripe structure.

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“…The A-site cations have a coordination number of "9", locating at the boundary between the two types of layers, while the B-site cations are positioned at the center of an octahedron formed by six oxygen anions. RP oxides have shown very attractive and versatile physical properties such as superconductivity [2][3][4][5][6], magnetoresistance [7][8][9][10][11], mixed ionic and electronic conductivity [12][13][14][15], giant and colossal dielectric [16][17][18][19], low loss microwave dielectric [20][21][22][23][24], photoluminescence [25][26][27][28][29], catalytic activity [30][31][32], thermoelectric [33][34][35], etc., which are useful for many energy and electronic devices. The A BO layered perovskites have recently attracted attention owing to their great environmental stability and versatile applications.…”

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confidence: 99%

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

2020

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In the last two decades, structure and properties of Ruddlesden-Popper phase (RP) A 2 BO 4 oxides with K 2 NiF 4 structure, have been widely investigated. But to the best of our knowledge, no review article is available in the literature on recent studies on these oxides. Therefore, in this article, recent studies on structure, electrical, dielectric, and optical properties of these oxides have been reviewed. Special attention is put on to highlight the effect of doping and oxygen stoichiometry on the structure and properties of these oxides. Further, important applications of these oxides have also been mentioned in this article.

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Normal modes of tetragonal La2NiO4 and La2CuO4, isomorphs of the hight Tc superconductor La2-xSrxCuO4

Cited by 32 publications

References 21 publications

Infrared response of ordered polarons in layered perovskites

Infrared response of ordered polarons in layered perovskites

Phonons and magnons in stripe-ordered nickelates. A Raman scattering study

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

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