Origin of ferroelectricity in high $T_c$ megnetoferroelectric CuO

Details Origin of ferroelectricity in high $T_c$ megnetoferroelectric CuO Origin of ferroelectricity in high $T_c$ megnetoferroelectric CuO

2010-07-14

arxiv.org/abs/1007.2274v3

Physics

Condensed Matter

Materials Science

Significantly revised, errors in previous version corrected, add a new figure

Scientific paper

Magnetoferroelectricity has been found in a wide range of spiral magnets. However, these materials all suffer from low critical temperatures, which are usually below 40 K, due to strong spin frustration. Recently, CuO has been found to be multiferroic at much higher ordering temperature ($\sim$ 230K). To clarify the origin of the high ordering temperature in CuO, we investigate the structural, electronic and magnetic properties of CuO via first-principles methods. We find that CuO has very special nearly commensurate spiral magnetic structure, which is stabilized via the Dzyaloshinskii-Moriya interaction. The spin frustration in CuO is relatively weak, which is one of the main reasons that the compound have high ordering temperature. We propose that high $T_c$ magnetoferroeletrics can be found in double-spin-chain structures similar to that of CuO.

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