Ca₃CoMnO_6, a quasi-1D Ising chain at low temperature offers rich fundamental physics and applications. We have studied the dielectric and magnetoelectric coupling in Fe doped Ca₃CoMnO₆ (CCMO) bulk ceramics prepared by co-precipitation technique. Single phase hexagonal crystal structure having R-3C space group was confirmed by x-ray diffraction. Extremely low currents were observed up to 20% Fe doping. Doping dependence of magnetoresistance (MR) revealed both positive and negative MR, with anomalously high MR values beyond 3000% in diluted Fe doped CCMO; whereas the higher doping of Fe was found to result in negative MR due to enhanced magnetostriction effects. The dielectric study was carried out for a range of 20 Hz to 10 MHz. The negative value of the colossal magnetodielectric induced in the Fe doped samples can be attributed to the magnetostriction effect along with interfacial Maxwell-Wagner polarization.

Ca ₃ CoMnO ₆是低温下的准一维 Ising 链，提供了丰富的基础物理和应用。我们研究了 Fe 掺杂 Ca ₃ CoMnO _{6 中}的介电和磁电耦合(CCMO) 通过共沉淀技术制备的块状陶瓷。X射线衍射证实了具有R-3C空间群的单相六方晶体结构。观察到高达 20% Fe 掺杂的极低电流。磁阻 (MR) 的掺杂依赖性显示正和负 MR，在稀释的 Fe 掺杂 CCMO 中具有超过 3000% 的异常高 MR 值；而由于增强的磁致伸缩效应，发现较高的 Fe 掺杂会导致负 MR。介电研究是在 20 Hz 至 10 MHz 的范围内进行的。在 Fe 掺杂的样品中感应出的巨大磁电介质的负值可归因于磁致伸缩效应以及界面 Maxwell-Wagner 极化。