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Articolul precedent |
Articolul urmator |
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SM ISO690:2012 MITTELSTÄDT, L., SCHMIDT, Michael, WANG, Zhe, MAYR, Franz, TSURKAN, Vladimir, LUNKENHEIMER, Peter, ISH, Daniel, BALENTS, Leon, DEISENHOFER, Joachim, LOIDL, Alois. Spin-orbiton and quantum criticality in FeSc2 S4. In: Physical Review B - Condensed Matter and Materials Physics, 2015, vol. 91, nr. 12, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.91.125112 |
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Physical Review B - Condensed Matter and Materials Physics | |
Volumul 91, Numărul 12 / 2015 / ISSN 1098-0121 /ISSNe 1550-235X | |
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DOI:https://doi.org/10.1103/PhysRevB.91.125112 | |
Pag. 0-0 | |
Rezumat | |
In FeSc2S4 spin-orbital exchange competes with strong spin-orbit coupling, suppressing long-range spin and orbital order and, hence, this material represents one of the rare examples of a spin-orbital liquid ground state. Moreover, it is close to a quantum-critical point separating the ordered and disordered regimes. Using terahertz and far-infrared spectroscopy we study low-lying excitations in FeSc2S4 and provide clear evidence for a spin-orbiton, an excitation of strongly entangled spins and orbitals. It becomes particularly well pronounced upon cooling, when advancing deep into the quantum-critical regime. Moreover, indications of an underlying structureless excitation continuum are found, a possible signature of quantum criticality. © 2015 American Physical Society. |
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