Novel multiferroic state and ME enhancement by breaking the AFM frustration in LuMn1−xO3
| Autor: | P. B. Tavares, S. Yáñez-Vilar, J. Agostinho Moreira, Dmitry V. Karpinsky, Michael Tovar, Vitor S. Amaral, J. N. Gonçalves, Alexandra Franz, A. F. Moreira Dos Santos, F. Figueiras |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Spins Condensed matter physics media_common.quotation_subject General Physics and Astronomy Frustration 02 engineering and technology 021001 nanoscience & nanotechnology Manganite 01 natural sciences Condensed Matter::Materials Science Polarization density Ferromagnetism 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Multiferroics Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology Néel temperature media_common |
| Zdroj: | Physical Chemistry Chemical Physics. 19:1335-1341 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c6cp07682c |
| Popis: | This study provides a comprehensive insight into the effects of controlled off-stoichiometry on the structural and multiferroic properties of the hexagonal manganite LuMn1-xO3+δ (x = 0.02; δ ∼ 0), supported by neutron powder diffraction measurements confirming single phase P63cm symmetry and evidencing a relevant ferromagnetic component, below TN ∼ 90 K, which breaks the archetypal geometrically frustrated antiferromagnetic state typically ascribed to LuMnO3. The perturbations in the triangular disposition of spins prompt an additional electric polarization contribution and a clear enhancement of the magnetoelectric coupling which are in good agreement with the results of first principles calculations. In addition, Raman spectroscopy, dielectric permittivity, pyroelectric current and magnetic measurements as a function of temperature point out the precursor effects of the magnetic phase transitions involving a strong coupling between spins, lattice and electric order, even above the Neel temperature. |
| Databáze: | OpenAIRE |
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