About: Possible coupling between magnons and phonons in multiferroic CaMn7O12

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://dx.doi.org/10.1103/PhysRevB.90.054307
Description	Spin and lattice dynamics of CaMn7O12 ceramics were investigated using infrared, THz, and inelastic neutron scattering (INS) spectroscopies in the temperature range 2 to 590 K, and, at low temperatures, in applied magnetic fields of up to 12 T. On cooling, we observed phonon splitting accompanying the structural phase transition at T-C = 450 K as well as the onset of the incommensurately modulated structure at 250 K. In the two antiferromagnetic phases below T-N1 = 90 K and T-N2 = 48 K, several infrared-active excitations emerge in the meV range; their frequencies correspond to the maxima in the magnon density of states obtained by INS. At the magnetic phase transitions, these modes display strong anomalies and, for some of them, a transfer of dielectric strength from the higher-frequency phonons is observed. We propose that these modes are electromagnons. Remarkably, at least two of these modes remain active also in the paramagnetic phase; for this reason, we call them paraelectromagnons. In accordance with this observation, quasielastic neutron scattering revealed short-range magnetic correlations persisting within temperatures up to 500 K above T-N1. Spin and lattice dynamics of CaMn7O12 ceramics were investigated using infrared, THz, and inelastic neutron scattering (INS) spectroscopies in the temperature range 2 to 590 K, and, at low temperatures, in applied magnetic fields of up to 12 T. On cooling, we observed phonon splitting accompanying the structural phase transition at T-C = 450 K as well as the onset of the incommensurately modulated structure at 250 K. In the two antiferromagnetic phases below T-N1 = 90 K and T-N2 = 48 K, several infrared-active excitations emerge in the meV range; their frequencies correspond to the maxima in the magnon density of states obtained by INS. At the magnetic phase transitions, these modes display strong anomalies and, for some of them, a transfer of dielectric strength from the higher-frequency phonons is observed. We propose that these modes are electromagnons. Remarkably, at least two of these modes remain active also in the paramagnetic phase; for this reason, we call them paraelectromagnons. In accordance with this observation, quasielastic neutron scattering revealed short-range magnetic correlations persisting within temperatures up to 500 K above T-N1. (en)
Title	Possible coupling between magnons and phonons in multiferroic CaMn7O12 Possible coupling between magnons and phonons in multiferroic CaMn7O12 (en)
skos:prefLabel	Possible coupling between magnons and phonons in multiferroic CaMn7O12 Possible coupling between magnons and phonons in multiferroic CaMn7O12 (en)
skos:notation	RIV/00216208:11320/14:10281076!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP204/12/1163), P(LG11024), P(LM2011025)
http://linked.open...iv/cisloPeriodika	5
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Prokleška, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	37914
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10281076
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	perovskite; spectroscopy; electromagnons (en)
http://linked.open.../riv/klicoveSlovo	spectroscopy perovskite electromagnons
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[99976A3090A0]
http://linked.open...i/riv/nazevZdroje	Physical Review B - Condensed Matter and Materials Physics
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	10 (xsd:int)
http://linked.open...vavai/riv/projekt	Phonon and dielectric spectroscopy of multiferroics Membership of CR in ILL MLTL - Magnetism and Low Temperature Laboratories - operation and development of national research infrastructure
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	90
http://linked.open...iv/tvurceVysledku	Kamba, Stanislav Kempa, Martin Orlita, Milan Goian, Veronica Kadlec, Christelle Kadlec, Filip Prokleška, Jan Rols, Stephane Taylor, Jon Vanek, Premysl
http://linked.open...ain/vavai/riv/wos	000341266400002
issn	1098-0121
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevB.90.054307
http://localhost/t...ganizacniJednotka	11320

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