一价阳离子掺杂体材料La1-xNaxMnO3中斜散射主导的反常能斯特效应
Skew scattering dominated anomalous Nernst effect in monovalent cation doped bulk La1-xNaxMnO3
摘要：
本文报道了La_（1-x）Na_xMnO_3（x = 0.02，0.05，0.1和0.3）的反常能斯特效应（ANE），即在外加温度梯度和磁场方向上产生横向电压，其铁磁固化温度（TC）从x = 0.02时的251 K变化到x = 0.3时的310 K。我们测量了ANE的磁场和温度依赖性。虽然ANE在TC以上可以忽略不计，但它在TC处迅速增加，并在TC下方显示出一个峰值。ANE的场依赖性密切遵循磁化强度。在TC时ANE的最大值从x = 0.02增加到0.1，但在x = 0.3时显著降低。除了ANE，我们还测量了直流电阻率和纵向塞贝克系数作为温度的函数，并使用这些数据来分析我们的结果。我们的数据分析表明斜散射是这些氧化物中ANE的主要来源。
英文摘要：
We report the anomalous Nernst effect (ANE), i.e. creation of electrical voltage transverse to the direction of applied temperature gradient and magnetic field in bulk samples of La1-xNaxMnO3 (x = 0.02, 0.05, 0.1 and 0.3) whose ferromagnetic Cure temperature(TC) varies from 251 K for x = 0.02 to 310 K for x = 0.3. We measured both the magnetic field and temperature dependences of ANE. While ANE is negligible much above TC, it increases rapidly at TC and exhibits a peak just below it. The field dependence of ANE closely follows magnetization. The maximum value of ANE at TC increases from x = 0.02 to 0.1, but decreases significantly for x = 0.3. Besides ANE, we also measured dc resistivity and longitudinal Seebeck coefficient as a function of temperature and used these data to analyze our results. Our data analysis indicates that skew scattering is the main source of the ANE in these oxides.
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