Ca3Mn2O7中未补偿自旋诱导的弱铁磁性：导磁效应和双磁容效应
Uncompensated-spins Induced Weak Ferromagnetism in Ca3Mn2O7: Magneto-conductive and dual Magneto-capacitive Effects
摘要：
单相正交晶系Ruddlesden-Popper锰氧化物Ca 3 Mn 2 O 7的磁化强度随温度变化的研究表明，在123 K以下存在反铁磁有序。磁场相关磁化强度M（H）在~ 110 K以下表现出偏心磁滞回线，证实了弱铁磁性（WFM）和交换偏置的存在，并详细研究了它们在冷却过程中的发展。WFM归因于AFM基质内未补偿的自旋团簇的形成，其由锰氧化物中的高各向异性稳定，有利于Dzyaloshinskiii-Moriya（D-M）相互作用。从M（H）回路评估的平均倾斜角的温度依赖性提供了WFM演变的定量测量。介电测量表现出导磁效应并发的WFM发病。Jonscher拟合的电导率等温线的低频/直流极限的温度依赖性证实了嵌入在绝缘体中的相对更导电的簇的存在。复阻抗的奈奎斯特阻抗分析揭示了两个弛豫，产生双磁场效应;集总电路参数特征异常的磁相位变化。
英文摘要：
Temperature dependent magnetization study on single phase orthorhombic Ruddlesden-Popper manganite Ca3Mn2O7 evidences antiferromagnetic (AFM) ordering below 123K. Field-dependent magnetization M(H) depicts off-centered hysteretic loops below ~110K-- confirming the existence of both weak ferromagnetism (WFM) and exchange bias, whose development upon cooling is examined in detail. WFM is attributed to the formation of uncompensated-spin-clusters within the AFM-matrix, stabilized by the high-anisotropy in the manganite, favoring Dzyaloshinskii-Moriya (D-M) interaction. Temperature dependence of an evaluated average canting angle from the M(H) loops provides a quantitative measure of the WFM-evolution. Dielectric measurements exhibit magneto-conductive effects concurrent to the WFM-onset. Temperature dependence of the low-frequency/dc-limit of Jonscher-fits to the conductivity isotherms confirms the presence of relatively more-conductive clusters, embedded in the insulating-bulk. Nyquist impedance-analysis of complex impedance reveals two relaxations, yielding dual magnetic-field effects; the lumped circuit parameters feature anomalies across the magnetic phase changes.
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