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首页> 外文期刊>RSC Advances >Influence of magnetic field on electrical and thermal transport in the hole doped ferromagnetic manganite: La0.9Na0.1MnO3
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Influence of magnetic field on electrical and thermal transport in the hole doped ferromagnetic manganite: La0.9Na0.1MnO3

机译：磁场对孔掺杂铁磁性锰矿中电气和热运输的影响：LA0.9NA0.1MNO3

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摘要

We report the magnetization (M), magnetostriction, electrical resistivity (rho), thermal conductivity (kappa) and thermopower (S) of polycrystalline La0.9Na0.1MnO3 over a wide temperature range of 5 to 360 K. This sample undergoes a paramagnetic to ferromagnetic transition around T-C = 274 K and electrical resistivity rho shows an insulator-metal transition around T-IM = 292 K. The sign of thermopower S is positive in the entire temperature range which indicates that majority charge carriers are holes. Thermopower exhibits a peak and thermal conductivity shows a dip at T-C in the absence of magnetic field. Large difference between the experimentally determined activation energies of rho and S in the insulating state indicates small polaron hopping dominant conduction above T-IM. Polaron formation above T-C, was further confirmed from the anomaly observed in thermal expansion (Delta L/L-0) which shows a change in slope at T-IM. In the vicinity of T-C at 3 T applied field, magneto-thermopower (similar to 61.5%) is larger than magnetothermal conductivity (similar to 12.7%) and magnetoresistance (similar to 49%).
机译：我们在宽温度范围为5至360k的宽温度范围内报告磁化（M），磁致伸缩，电阻率（RHO），导热率（Kappa）和散热器，导热率（κ）和热电驱。该样品经历副古代Tc = 274k周围的铁磁过渡和电阻率rho显示了T-IM = 292 K周围的绝缘金属转换。热电气S的符号在整个温度范围内是正的，表示多个电荷载体是孔。热电机表现出峰值，导热率在没有磁场的情况下在T-C处倾向。在绝缘状态下的实验确定的rho和s的激活能量之间的差异表明在T-Im上方的小极化跳跃显性导通。从热膨胀（Delta L / L / L / L / L / L / L-0）中观察到的异常中进一步证实了T-C上方的极化子形成，其显示在T-Im的斜率变化。在3T施加的场的T-C附近，磁热电机（类似于61.5％）大于磁热导电（类似于12.7％）和磁阻（类似于49％）。

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  • 来源
    《RSC Advances》 |2019年第3期|共8页
  • 作者

    Das Rajasree; Chanda Amit; Mahendiran Ramanathan;

  • 作者单位

    Natl Univ Singapore Fac Sci Dept Phys 2 Sci Dr 3 Singapore 117542 Singapore;

    Natl Univ Singapore Fac Sci Dept Phys 2 Sci Dr 3 Singapore 117542 Singapore;

    Natl Univ Singapore Fac Sci Dept Phys 2 Sci Dr 3 Singapore 117542 Singapore;

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  • 正文语种 eng
  • 中图分类 化学;
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