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 SM ISO690:2012DEISENHOFER, Joachim, MAYR, Franz, SCHMIDT, Michael, LOIDL, Alois, TSURKAN, Vladimir. Infrared-active phonons in the ferrimagnetic and multiferroic phases of FeCr2 S4: Evidence for structural distortions. In: Physical Review B, 2019, vol. 100, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.100.144428 |
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  Physical Review B |
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| Volumul 100 / 2019 / ISSN 2469-9950 /ISSNe 2469-9969 | ||||||
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| DOI:https://doi.org/10.1103/PhysRevB.100.144428 | ||||||
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We report on the temperature evolution of the infrared-active optical phonons in FeCr2S4 investigated by Fourier-transform infrared spectroscopy. The eigenfrequencies of the four triply degenerate infrared-active T1u phonons of the room-temperature cubic spinel structure shift when entering into the ferrimagnetically ordered state below TC=165K indicating strong spin-phonon coupling as reported earlier. A new mode at 200 cm-1 emerges below a temperature T∗≃115K and a splitting of the lowest-lying cubic phonon mode at about 120 cm-1 appears below the temperature TM≈60K associated with the onset of an incommensurate modulation of the magnetic structure. At the transition to the orbitally ordered and ferroelectric ground state at TOO=9K two more modes emerge at 146 and 253 cm-1 in very good agreement with the eigenfrequencies of two of the cubic Raman-active phonon modes reported by Choi et al. [J. Phys. Condens. Matter 19, 145260 (2007)JCOMEL0953-898410.1088/0953-8984/19/14/145260]. These new modes are interpreted as signatures of a symmetry lowering with a loss of inversion symmetry to induce the multiferroic orbitally ordered ground state. |
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| Cuvinte-cheie Binary alloys, Fourier transform infrared spectroscopy, Ground state, phonons |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Deisenhofer, J.</dc:creator> <dc:creator>Mayr, F.</dc:creator> <dc:creator>Schmidt, M.</dc:creator> <dc:creator>Loidl, A.</dc:creator> <dc:creator>Ţurcan, V.V.</dc:creator> <dc:date>2019-10-18</dc:date> <dc:description xml:lang='en'><p>We report on the temperature evolution of the infrared-active optical phonons in FeCr2S4 investigated by Fourier-transform infrared spectroscopy. The eigenfrequencies of the four triply degenerate infrared-active T1u phonons of the room-temperature cubic spinel structure shift when entering into the ferrimagnetically ordered state below TC=165K indicating strong spin-phonon coupling as reported earlier. A new mode at 200 cm-1 emerges below a temperature T∗≃115K and a splitting of the lowest-lying cubic phonon mode at about 120 cm-1 appears below the temperature TM≈60K associated with the onset of an incommensurate modulation of the magnetic structure. At the transition to the orbitally ordered and ferroelectric ground state at TOO=9K two more modes emerge at 146 and 253 cm-1 in very good agreement with the eigenfrequencies of two of the cubic Raman-active phonon modes reported by Choi et al. [J. Phys. Condens. Matter 19, 145260 (2007)JCOMEL0953-898410.1088/0953-8984/19/14/145260]. These new modes are interpreted as signatures of a symmetry lowering with a loss of inversion symmetry to induce the multiferroic orbitally ordered ground state. </p></dc:description> <dc:identifier>10.1103/PhysRevB.100.144428</dc:identifier> <dc:source>Physical Review B () 0-0</dc:source> <dc:subject>Binary alloys</dc:subject> <dc:subject>Fourier transform infrared spectroscopy</dc:subject> <dc:subject>Ground state</dc:subject> <dc:subject>phonons</dc:subject> <dc:title>Infrared-active phonons in the ferrimagnetic and multiferroic phases of FeCr2 S4: Evidence for structural distortions</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>
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