green lines fitted by the ohmic law. (c) Measured V/ I as a function of I2 at the LRS in high field region (0.3→0.75 V). (d) ln(I/V) as a function of V1/2 at the HRS in high field region (2.9→3.8 V)..Р镁掺杂可增强Ca3Co2-xMnxO6的多铁性РApplied Physics Letters 96 (2010) 022516Р论文提供:刘俊明教授南京大学物理系Р近期新合成的一种自旋链结构的磁体Ca3Co2-yMnyO6(y~1.0)成为近期多铁研究的一个热点。为研究A位掺杂对Ca3Co2-yMnyO6(y~1.0)的影响,制备了多晶样品Ca3-xMgxCo2-yMnyO6(y~1.0)。与Ca3Co2-yMnyO6(y~1.0)相比,Ca3-xMgxCo2-yMnyO6(y~1.0)的铁电极性和居里点在最大掺杂x~0.3处被显著地增强。Ca3-xMgxCo2-yMnyO6(x~0.3, y~1.0)的磁有序和铁电有序比未掺杂的化合物Ca3Co2-yMnyO6(y~1.0)更强。由于Mg替代了Ca使得晶格产生了轻微的收缩,从而加强了交换约束收缩的效果,导致磁性和铁电性的改变。Р(a) Polarization P of MO and CMCM as a function of T. The samples were poled from 200 to 2 K under an electric field of 16.7 kV/cm. (b) ic susceptibility χ as a function of T under H=100 Oe for MO and CMCM.
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