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SM ISO690:2012 FELEA, Viorel, YASIN, Shadi, GUNTHER, A., DEISENHOFER, Joachim, KRUG VON NIDDA, Hans Albrecht, ZHERLITSYN, S., TSURKAN, Vladimir, LEMMENS, Peter, WOSNITZA, Joachim, LOIDL, Alois. Spin-lattice coupling in the frustrated antiferromagnet ZnCr 2Se 4 probed by ultrasound. In: Physical Review B - Condensed Matter and Materials Physics, 2012, vol. 86, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.86.104420 |
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Physical Review B - Condensed Matter and Materials Physics | |
Volumul 86 / 2012 / ISSN 1098-0121 /ISSNe 1550-235X | |
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DOI:https://doi.org/10.1103/PhysRevB.86.104420 | |
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Rezumat | |
Ultrasound and magnetization studies of the frustrated spinel ZnCr 2Se 4 are performed as a function of temperature and magnetic field up to 14 T. In zero field, the sound velocity and attenuation reveal significant anomalies at the antiferromagnetic transition at T N 21 K indicating strong spin-lattice coupling. External magnetic fields shift these anomalies to lower temperatures concomitantly with the reduction of the Néel temperature. At 2 K, the sound velocity as a function of magnetic field manifests three pronounced anomalies: a deep minimum at 5.4 T related to an inflection point of the magnetization followed by two plateaus with distinct stiffness at fields above 7 and 10 T. The first plateau is ascribed to a transformation from a tetragonal to a cubic phase, while the second one corresponds to a state with fully polarized magnetization. The evolution of magnetic and structural states is discussed within a H-T phase diagram and compared with related frustrated magnetic spinels with strong spin-lattice coupling. |
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Cuvinte-cheie magnetism, Curie Temperature, Antiferromagnet |
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