dorsal/arxiv
View SchemaPhonons and Magnetic Excitations in Mott-Insulator LaTiO$_3$
| Authors | M. N. Iliev, A. P. Litvinchuk, M. V. Abrashev, V. N. Popov, J. Cmaidalka, B. Lorenz, R. L. Meng |
|---|---|
| Categories | |
| ArXiv ID | physics/0310097 |
| URL | https://arxiv.org/abs/physics/0310097 |
| DOI | 10.1103/PhysRevB.69.172301 |
Abstract
The polarized Raman spectra of stoichiometric LaTiO$_3$ (T$_N = 150$ K) were measured between 6 and 300 K. In contrast to earlier report on half-metallic LaTiO$_{3.02}$, neither strong background scattering, nor Fano shape of the Raman lines was observed. The high frequency phonon line at 655 cm$^{-1}$ exhibits anomalous softening below T$_N$: a signature for structural rearrangement. The assignment of the Raman lines was done by comparison to the calculations of lattice dynamics and the nature of structural changes upon magnetic ordering are discussed. The broad Raman band, which appears in the antiferromagnetic phase, is assigned to two-magnon scattering. The estimated superexchange constant $J = 15.4\pm0.5$ meV is in excellent agreement with the result of neutron scattering studies.
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"abstract": "The polarized Raman spectra of stoichiometric LaTiO$_3$ (T$_N = 150$ K) were\nmeasured between 6 and 300 K. In contrast to earlier report on half-metallic\nLaTiO$_{3.02}$, neither strong background scattering, nor Fano shape of the\nRaman lines was observed. The high frequency phonon line at 655 cm$^{-1}$\nexhibits anomalous softening below T$_N$: a signature for structural\nrearrangement. The assignment of the Raman lines was done by comparison to the\ncalculations of lattice dynamics and the nature of structural changes upon\nmagnetic ordering are discussed. The broad Raman band, which appears in the\nantiferromagnetic phase, is assigned to two-magnon scattering. The estimated\nsuperexchange constant $J = 15.4\\pm0.5$ meV is in excellent agreement with the\nresult of neutron scattering studies.",
"arxiv_id": "physics/0310097",
"authors": [
"M. N. Iliev",
"A. P. Litvinchuk",
"M. V. Abrashev",
"V. N. Popov",
"J. Cmaidalka",
"B. Lorenz",
"R. L. Meng"
],
"categories": [
"physics.optics",
"cond-mat.str-el"
],
"doi": "10.1103/PhysRevB.69.172301",
"title": "Phonons and Magnetic Excitations in Mott-Insulator LaTiO$_3$",
"url": "https://arxiv.org/abs/physics/0310097"
},
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