High-Tc ferrolectricity emerging from magnetic degeneracy in cupric oxide

Abstract

Cupric oxide is multiferroic at unusual high temperatures. From density functional calculations we find that the low-T magnetic phase is paraelectric and the higher-T one ferroelectric, with a size and direction of polarization in good agreement with experiment. By mapping of the ab initio results on an effective spin model we find with Monte Carlo that in the high-T magnetic state non-collinearity and inversion symmetry breaking stabilize each other via the Dzyaloshinskii Moriya interaction. This leads to a novel mechanism for multiferroicity, with the particular property that non-magnetic impurities enhance the effect.

4 pages, 3 figures, figures and text substantially improved. Title changed

References in corpus (1)

• Chiral spin pairing in helical magnets

Cited by in corpus (28)

• Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
• First principles study of electronic and structural properties of CuO
• Electronic Structure and Spectra of CuO
• Magnetoelectric effect and phase transitions in CuO in external magnetic fields
• Tuning magnetic spirals beyond room temperature with chemical disorder
• Electric field control of chiral magnetic domains in the high-temperature multiferroic CuO
• Incommensurate magnetic structure, Fe/Cu chemical disorder and magnetic interactions in the high-temperature multiferroic YBaCuFeO5
• Origin of ferroelectricity in high-$T_c$ magnetic ferroelectric CuO
• Thermodynamic Properties of the Anisotropic Frustrated Spin-chain Compound Linarite PbCuSO${}_4$(OH)${}_2$
• Microscopic origin of large negative magneto-electric coupling in Sr${}_{1/2}$Ba${}_{1/2}$MnO${}_3$
• Magnetic Phase Diagram of CuO
• Thermodynamic properties of the new multiferroic material (NH${}_4$)${}_2$[FeCl${}_5$(H${}_2$O)]
• Advances in ab-initio theory of Multiferroics. Materials and mechanisms: modelling and understanding
• Ferroelectric Ferrimagnetic LiFe${}_2$F${}_6$: Charge Ordering Mediated Magnetoelectricity
• Ab initio calculation of d-d excitations in quasi-one-dimensional Cu d9 correlated materials
• Tuning order-by-disorder multiferroicity in CuO by doping
• Spin dynamics and exchange interactions in CuO measured by neutron scattering
• Nature of the spiral state, electric polarisation and magnetic transitions in Sr-doped YBaCuFeO${}_5$: A first-principles study
• Ultrafast cooling and heating scenarios for the laser induced phase transition in CuO
• Low temperature magnetism of KAgF3
• Interpretation of magnetoelectric phase states using the praphase concept and exchange symmetry
• High temperature non-collinear magnetism in a classical bilinear-biquadratic Heisenberg model
• Orbital driven impurity spin effect on the magnetic order of quasi-three dimensional cupric oxide
• Tracking a hysteretic and disorder-broadened phase transition via the electromagnon response in improper ferroelectrics
• X-ray diffraction study of epitaxial CuO nanostructures obtained through post-deposition annealing of Cu on SrTiO${}_3$(001)
• Unfolding femtoscale ionic movement in CuO through polarized Raman spectroscopy
• Thermal stimulated current response in cupric oxide single crystal thin films over a wide temperature range
• High-pressure cupric oxide: a room-temperature multiferroic