Materials that combine coupled electric and magnetic dipole order are termed 'magnetoelectric mul... more Materials that combine coupled electric and magnetic dipole order are termed 'magnetoelectric multiferroics' 1–4. In the past few years, a new class of such materials, 'induced-multiferroics', has been discovered 5,6 , wherein non-collinear spiral magnetic order breaks inversion symmetry, thus inducing ferroelectricity 7–9. Spiral magnetic order often arises from the existence of competing magnetic interactions that reduce the ordering temperature of a more conventional collinear phase 10. Hence, spiral-phase-induced ferroelectricity tends to exist only at temperatures lower than ∼40 K. Here, we propose that copper(II) oxides (containing Cu 2+ ions) having large magnetic superexchange interactions 11 can be good candidates for induced-multiferroics with high Curie temperature (T C). In fact, we demonstrate ferroelectricity with T C = 230 K in cupric oxide, CuO (tenorite), which is known as a starting material for the synthesis of high-T c (critical temperature) superconductors.
Materials that combine coupled electric and magnetic dipole order are termed 'magnetoelectric mul... more Materials that combine coupled electric and magnetic dipole order are termed 'magnetoelectric multiferroics' 1–4. In the past few years, a new class of such materials, 'induced-multiferroics', has been discovered 5,6 , wherein non-collinear spiral magnetic order breaks inversion symmetry, thus inducing ferroelectricity 7–9. Spiral magnetic order often arises from the existence of competing magnetic interactions that reduce the ordering temperature of a more conventional collinear phase 10. Hence, spiral-phase-induced ferroelectricity tends to exist only at temperatures lower than ∼40 K. Here, we propose that copper(II) oxides (containing Cu 2+ ions) having large magnetic superexchange interactions 11 can be good candidates for induced-multiferroics with high Curie temperature (T C). In fact, we demonstrate ferroelectricity with T C = 230 K in cupric oxide, CuO (tenorite), which is known as a starting material for the synthesis of high-T c (critical temperature) superconductors.
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Papers by jean salazar