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SM ISO690:2012 TSURKAN, Vladimir, PRODAN, Lilian, FELEA, Viorel, FILIPPOVA, Irina, KRAVTSOV, Victor, GUNTHER, A., WIDMANN, S., KRUG VON NIDDA, Hans Albrecht, DEISENHOFER, Joachim, LOIDL, Alois. Structure, magnetic susceptibility, and specific heat of the spin-orbital-liquid candidate FeS c2 S4: Influence of Fe off-stoichiometry. In: Physical Review B, 2017, vol. 96, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.96.054417 |
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Physical Review B | ||||||
Volumul 96 / 2017 / ISSN 2469-9950 /ISSNe 2469-9969 | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.96.054417 | ||||||
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We report structure, susceptibility, and specific heat studies of stoichiometric and off-stoichiometric poly- and single crystals of the A-site spinel compound FeSc2S4. In stoichiometric samples, no long-range magnetic order is found down to 1.8 K. The magnetic susceptibility of these samples is field independent in the temperature range 10-400 K and does not show irreversible effects at low temperatures. In contrast, the magnetic susceptibility of samples with iron excess shows substantial field dependence at high temperatures and manifests a pronounced magnetic irreversibility at low temperatures with a difference between zero-field cooled (ZFC) and field cooled (FC) susceptibilities and a maximum at 10 K, reminiscent of a magnetic transition. Single-crystal x-ray diffraction of the stoichiometric samples revealed a single phase spinel structure without site inversion. In single crystalline samples with Fe excess, in addition to the main spinel phase, a second ordered single-crystal phase was detected with the diffraction pattern of a vacancy-ordered superstructure of iron sulfide, close to the 5C polytype Fe9S10. Specific heat studies reveal a broad anomaly, which evolves below 20 K in both stoichiometric and off-stoichiometric crystals. We show that the low-temperature specific heat can be well described by considering the low-lying spin-orbital electronic levels of Fe2+ ions. Our results demonstrate significant influence of excess Fe ions on intrinsic magnetic behavior of FeSc2S4 and provide support for the spin-orbital liquid scenario proposed in earlier studies for the stoichiometric compound. |
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Cuvinte-cheie magnetism, Curie Temperature, Antiferromagnet |
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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>Ţurcan, V.V.</dc:creator> <dc:creator>Prodan, L.I.</dc:creator> <dc:creator>Felea, V.U.</dc:creator> <dc:creator>Filippova, I.G.</dc:creator> <dc:creator>Kravţov, V.H.</dc:creator> <dc:creator>Günther, A.</dc:creator> <dc:creator>Widmann, S.</dc:creator> <dc:creator>Krug Von Nidda, H.</dc:creator> <dc:creator>Deisenhofer, J.</dc:creator> <dc:creator>Loidl, A.</dc:creator> <dc:date>2017-08-11</dc:date> <dc:description xml:lang='en'><p>We report structure, susceptibility, and specific heat studies of stoichiometric and off-stoichiometric poly- and single crystals of the A-site spinel compound FeSc2S4. In stoichiometric samples, no long-range magnetic order is found down to 1.8 K. The magnetic susceptibility of these samples is field independent in the temperature range 10-400 K and does not show irreversible effects at low temperatures. In contrast, the magnetic susceptibility of samples with iron excess shows substantial field dependence at high temperatures and manifests a pronounced magnetic irreversibility at low temperatures with a difference between zero-field cooled (ZFC) and field cooled (FC) susceptibilities and a maximum at 10 K, reminiscent of a magnetic transition. Single-crystal x-ray diffraction of the stoichiometric samples revealed a single phase spinel structure without site inversion. In single crystalline samples with Fe excess, in addition to the main spinel phase, a second ordered single-crystal phase was detected with the diffraction pattern of a vacancy-ordered superstructure of iron sulfide, close to the 5C polytype Fe9S10. Specific heat studies reveal a broad anomaly, which evolves below 20 K in both stoichiometric and off-stoichiometric crystals. We show that the low-temperature specific heat can be well described by considering the low-lying spin-orbital electronic levels of Fe2+ ions. Our results demonstrate significant influence of excess Fe ions on intrinsic magnetic behavior of FeSc2S4 and provide support for the spin-orbital liquid scenario proposed in earlier studies for the stoichiometric compound.</p></dc:description> <dc:identifier>10.1103/PhysRevB.96.054417</dc:identifier> <dc:source>Physical Review B () 0-0</dc:source> <dc:subject>magnetism</dc:subject> <dc:subject>Curie Temperature</dc:subject> <dc:subject>Antiferromagnet</dc:subject> <dc:title>Structure, magnetic susceptibility, and specific heat of the spin-orbital-liquid candidate FeS c2 S4: Influence of Fe off-stoichiometry</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>