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<identifier identifierType='DOI'>10.1103/PhysRevB.100.144428</identifier>
<creators>
<creator>
<creatorName>Deisenhofer, J.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Mayr, F.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Schmidt, M.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Loidl, A.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Ţurcan, V.V.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
</creators>
<titles>
<title xml:lang='en'>Infrared-active phonons in the ferrimagnetic and multiferroic phases of FeCr2 S4: Evidence for structural distortions</title>
</titles>
<publisher>Instrumentul Bibliometric National</publisher>
<publicationYear>2019</publicationYear>
<relatedIdentifier relatedIdentifierType='ISSN' relationType='IsPartOf'>2469-9950</relatedIdentifier>
<subjects>
<subject>Binary alloys</subject>
<subject>Fourier transform infrared spectroscopy</subject>
<subject>Ground state</subject>
<subject>phonons</subject>
</subjects>
<dates>
<date dateType='Issued'>2019-10-18</date>
</dates>
<resourceType resourceTypeGeneral='Text'>Journal article</resourceType>
<descriptions>
<description xml:lang='en' descriptionType='Abstract'><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&lowast;≃115K and a splitting of the lowest-lying cubic phonon mode at about 120 cm-1 appears below the temperature TM&asymp;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.&nbsp;</p></description>
</descriptions>
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