Dielectric, magnetic, and thermodynamic properties of Y1−xSrxMnO3 (x = 0.1 and 0.2)
Dielectric, magnetic, and thermodynamic properties of Y1−xSrxMnO3 (x = 0.1 and 0.2)
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DOI：
10.1063/1.4766751
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发表时间：
2012-11
影响因子：
3.2
通讯作者：
R. Thakur;R. Thakur;S. Samatham;N. Kaurav;V. Ganesan;N. Gaur;G. Okram
中科院分区：
文献类型：
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作者：
R. Thakur;R. Thakur;S. Samatham;N. Kaurav;V. Ganesan;N. Gaur;G. Okram
报道了锶掺杂对传统固相反应法制备的多晶Y1−xSrxMnO3(x=0.1，0.2)样品的介电、磁化强度和热力学性质的影响。介电常数和比热随温度的变化曲线明显地显示出在其磁转变点附近的反常现象，即尼尔温度(TN)，这可能是由于三角锰晶格上的Mn3+自旋(S=2)受阻而产生的，表现出电序和磁序之间的磁电耦合。然而，由于Mn三角晶格受挫和Y3+自旋的顺磁性占优势，磁化率的磁化转变并不明显。在传统阿累尼乌斯定律的框架下分析了这些材料中的电子输运机制，即ρ(T)=Cexp(Ea/Kbt)适用于低频交流电阻率数据，并通过峰值方法计算了介电常数和损耗。
We report the effect of strontium (Sr) doping on dielectric, magnetization, and thermodynamic properties of polycrystalline Y1−xSrxMnO3 (x = 0.1, 0.2) samples prepared by conventional solid-state reaction method. The temperature dependent dielectric permittivity and specific heat curves noticeably show the anomalies near its magnetic transition point, i.e., Neel temperature (TN), which are probably generated by the frustrated Mn3+ spins (S = 2) on a triangular Mn lattice showing the magneto-electric coupling between the electric and magnetic orders. However, the magnetic transition is not clearly evident in the magnetic susceptibility due to the frustration on the Mn triangular lattice and the dominating paramagnetic susceptibility of the Y3+ spins. The electronic transport mechanism in these materials was analyzed within the framework of conventional Arrhenius Law, i.e., ρ(T) = C exp(Ea/kBT) applied to low frequency ac resistivity data, and through the peak method employed to the permittivity and loss ta...