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Magnetoelectric effect and phase transitions in CuO in external magnetic fields
Zhaosheng Wang1, Navid Qureshi2, Shadi Yasin1,3
1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany.
Nature Communications
|January 19, 2016
Summary
Copper oxide (CuO) exhibits a high multiferroic transition temperature. High magnetic fields reveal hidden magnetoelectric effects, demonstrating CuO
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- CuO is the only known binary multiferroic compound.
- It possesses a high transition temperature (230 K) for magnetically induced ferroelectricity.
- Direct magnetoelectric crosstalk in CuO has not been previously observed.
Purpose of the Study:
- To investigate the magnetoelectric properties of CuO under high magnetic fields.
- To uncover hidden magnetoelectric features in the multiferroic phase of CuO.
- To establish CuO as a prototype multiferroic material.
Main Methods:
- Application of high magnetic fields (up to ≈ 50 T).
- Investigation of spin modulation and electric polarization changes.
- Analysis of structural transitions near the ferroelectric transition temperature (213 K).
Main Results:
- High magnetic fields suppress helical spin modulation and significantly alter electric polarization.
- Modest magnetic fields induce an incommensurate ferroelectric structure below 213 K.
- Higher magnetic fields suppress this field-induced incommensurate structure.
Conclusions:
- CuO exhibits remarkable hidden magnetoelectric coupling.
- The material demonstrates complex interplay between magnetic order and electric polarization.
- CuO is a promising prototype multiferroic with significant potential for future research.
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