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SM ISO690:2012 HEMBERGER, Joachim, LUNKENHEIMER, Peter, FICHTL, Robert, KRUG VON NIDDA, Hans Albrecht, TSURKAN, Vladimir, LOIDL, Alois. Relaxor ferroelectricity and colossal magnetocapacitive coupling in ferromagnetic CdCr2S4. In: Nature, 2005, vol. 434, pp. 364-367. ISSN 0028-0836. DOI: https://doi.org/10.1038/nature03348 |
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Nature | |
Volumul 434 / 2005 / ISSN 0028-0836 | |
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DOI:https://doi.org/10.1038/nature03348 | |
Pag. 364-367 | |
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Materials in which magnetic and electric order coexist-termed 'multiferroics' or 'magnetoelectrics'-have recently become the focus of much research. In particular, the simultaneous occurrence of ferromagnetism and ferroelectricity, combined with an intimate coupling of magnetization and polarization via magnetocapacitive effects, holds promise for new generations of electronic devices. Here we present measurements on a simple cubic spinel compound with unusual, and potentially useful, magnetic and electric properties: it shows ferromagnetic order coexisting with relaxor ferroelectricity (a ferroelectric cluster state with a smeared-out phase transition), both having sizable ordering temperatures and moments. Close to the ferromagnetic ordering temperature, the magnetocapacitive coupling (characterized by a variation of the dielectric constant in an external magnetic field) reaches colossal values, approaching 500 per cent. We attribute the relaxor properties to geometric frustration, which is well known for magnetic moments but here is found to impede long-range order of the structural degrees of freedom that drive the formation of the ferroelectric state. |
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Cuvinte-cheie Engineering controlled terms Capacitance, Degrees of freedom (mechanics), Electric impedance, ferromagnetism, Magnetic field effects, Magnetic moments, magnetization, Permittivity EMTREE drug terms cadmium, Chromium, ferromagnetic material, sulfur derivative GEOBASE Subject Index physics EMTREE medical terms article, Device, dielectric constant, electricity, electrochemical analysis, Ferroelectricity, magnetic field, magnetism, Materials testing, phase transition, polarization, priority journal, relaxor, temperature measurement Engineering uncontrolled terms Colossal magnetocapacitive coupling, Electronic devices, multiferroics, Relaxor ferroelectrics Engineering main heading Ferroelectricity |
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