| 摘要(英) |
Many novel physical behaviors have recently been identified in novel-metal tellurates M3TeO6, where M is a first-row transition metal. Simple commensurate (CM) and complex incommensurate (ICM) spin structures, spontaneous and magnetic-field-driven electrical polarization have all been detected. Very fruitful physical properties that associated with three phase transitions have been observed in Co3TeO6. The monoclinic Co3TeO6 has been characterized as a type-II multiferroic, where CM and ICM spin structures have been identified to associated with separate atomic layers, magnetic incommensurability changes regularly and largely with temperature, the development of ferroelectricity links closely to local domain atomic non-uniformity, and a significant amount of electronic charges shifts to regions where local crystallographic distortions and/or asymmetry appear through ferroelectric transition. There are two crystallographic distinct Co layers in Co3TeO6. It has been demonstrated that the Co ions in the honeycomb web link to the ferroelectricity greatly better than those Co spins in the separated zigzag chains. Cu-doping to replace the Co ions in the zigzag chains (the x = 1 sample) or in the honeycomb web (the x = 2 sample) can provide in depth information on the strength of the coupling of the zigzag chains or honeycomb web to ferroelectricity. On the other hand, studies made on the magnetic and electric properties of Co3TeO6 are still very limited. An antiferromagnetic transition was observed below 60 K. This anomaly is believed to be associated with the mixed Cu+/Cu2+ valence in the Cu3TeO6 ceramics. The magnetic and electric properties and the interplay between the electrics and magnetic degree of freedom in Cu-doped Co3-xCuxTeO6 will be again complex and fruitful. We aim to study the magnetic structure and interplay between ferroelectric and magnetic parameters in Cu-doped Co3-xCuxTeO6 with x = 0.06, 0.12, 0.18, 1 and 2. |
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