论文标题
LA0.5CA0.5COO中的异常Nernst效果3
Anomalous Nernst effect in La0.5Ca0.5Coo3
论文作者
论文摘要
我们报告了多晶Perovskite La0.5CA0.5COO3中异常Nernst效应（ANE）的发生。该样品的铁磁低于TC = 147 K，电阻率在TC上方和下方显示出非金属行为，而TC周围仅较小的负磁磁性（〜2％）。磁化在10 K上的磁化依赖性显示出大型滞后作用，其强制场为6 KOE，但在50 KOE的磁场中，较小的磁化强度〜0.64 Bohr Magneton/co，这表明存在磁性异构的基态，由铁磁性和非富特电磁相组成。在低温下，Nernst Thermotower（SXY）的场依赖性显示出完全饱和，但磁化没有。这表明LA0.5CA0.5COO3中的ANE仅取决于铁磁相的传输特性，而不受非铁磁相影响。由于残留的SXY值较高，因此在没有外部磁场的情况下，磁化的多晶样品表现出ANE。
We report the occurrence of the anomalous Nernst effect (ANE) in polycrystalline perovskite La0.5Ca0.5CoO3. The sample is ferromagnetic below TC = 147 K and resistivity shows non-metallic behavior above and below the TC with only a small negative magnetoresistance (~2%) around TC. Field dependence of magnetization at 10 K shows large hysteresis with a coercive field of 6 kOe but a small magnetization ~ 0.64 Bohr magneton/Co even in a field of 50 kOe, which indicates the presence of magnetically heterogeneous ground state consisting of ferromagnetic and non-ferromagnetic phases. The field dependence of the Nernst thermopower (Sxy) at low temperatures shows complete saturation but the magnetization does not. This indicates that the ANE in La0.5Ca0.5CoO3 depends only on the transport properties of the ferromagnetic phase, while it is not affected by the non-ferromagnetic phase. Due to the higher value of remnant Sxy, the magnetized polycrystalline sample exhibits ANE in absence of an external magnetic field.
