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Title: Manifestation of quantum rotor orbital excitations in Raman spectra of Jahn-Teller crystal LaMnO3
Authors: Kovaleva, Natalia N.
Kusmartseva, Olga E.
Kugel, K.I.
Kusmartsev, F.V.
Issue Date: 2017
Publisher: © the Authors. Published by IOP
Citation: KOVALEVA, N.N., 2017. Manifestation of quantum rotor orbital excitations in Raman spectra of Jahn-Teller crystal LaMnO3. Journal of Physics: Conference Series, 833: 012005.
Abstract: © Published under licence by IOP Publishing Ltd.Materials, consisting of Jahn-Teller (JT) ions, such as cuprates and manganites, display many outstanding properties, including high temperature superconductivity and colossal magnetoresistance. There, the role of JT effect, although widely recognized, is still elusive. Here we show that these materials have vibronic excitations, related to local deformations rotating around JT ions in the dynamic limit, arising from linear electron-vibrational coupling in the "Mexican hat" potential profile. Their energy depends on total angular momentum, which is quantized, as in quantum rotors. We found them in the representative JT compound of orthorhombic manganites, LaMnO3. Since the "Mexican hat" potential energy surface is double-valued, they show up near the ground and excited states of JT ions. Recently, by using spectroscopic ellipsometry technique, we showed that they appear in the excited state in the form of sidebands, accompanying the electron transition between the JT split orbitals at neighboring Mn3+ ions. Here, by using Raman scattering technique, we show that they also exist near the ground state. The found quantum rotor excitations may play an important role in many unusual properties observed in these materials.
Description: This is an Open Access Article. It is published by IOP under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Sponsor: This work was supported by the Russian Foundation for Basic Research, projects 16-02-00304 and 17-02-00323
Version: Published
DOI: 10.1088/1742-6596/833/1/012005
URI: https://dspace.lboro.ac.uk/2134/25568
Publisher Link: http://dx.doi.org/10.1088/1742-6596/833/1/012005
ISSN: 1742-6588
Appears in Collections:Published Articles (Physics)

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