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arXiv 1602.02479cond-mat.mtrl-sci
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钇掺杂CaMnO3的相分离行为

Phase separated behavior in Yttrium doped CaMnO3

Neetika Sharma, A. Das, C. L. Prajapat, Amit Kumar, M. R. Singh

摘要:

利用中子衍射、中子去极化、磁化强度和电阻率技术研究了电子掺杂对富Mn(IV)Ca_(1-x)Y_xMnO_3(x < 0.2)样品的结构、输运和磁性的影响。电阻率的温度依赖性遵循小极化子模型和激活能表现出最小的x=0.1的样品。在x = 0.1的样品中观察到由嵌入在G型反铁磁基体中的铁磁畴(~ 7微米)组成的相分离的磁基态。在该样品中,向长程磁有序态的转变之前是Griffiths相。在x=0.2的样品中,当温度低于300 K时,观察到由正交结构(Pnma)向单斜结构(P21/m)的结构转变。在这种情况下的铁磁行为被抑制和反铁磁有序的描述由共存的C型和G型磁结构对应的单斜和正交相,分别。<

英文摘要:

The effect of electron doping on the structural, transport, and magnetic properties of Mn (IV) - rich Ca1-xYxMnO3 (x < 0.2) samples have been investigated using neutron diffraction, neutron depolarization, magnetization and resistivity techniques. The temperature dependence of resistivity follows the small polaron model and the activation energy exhibits a minimum for x=0.1 sample. A phase separated magnetic ground state consisting of ferromagnetic domains (~7microns) embedded in G-type antiferromagnetic matrix is observed in the sample, x = 0.1. The transition to the long range magnetically ordered state in this sample is preceded by a Griffiths phase. On lowering temperature below 300K a structural transition from orthorhombic structure (Pnma) to a monoclinic structure (P21/m) is observed in the case of x=0.2 sample. The ferromagnetic behavior in this case is suppressed and the antiferromagnetic ordering is described by coexisting C-type and G-type magnetic structures corresponding to the monoclinic and orthorhombic phases, respectively.<

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