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首页> 外文期刊>Physical review >Magnon-bipolar carrier drag thermopower in antiferromagnetic/ferromagnetic semiconductors: Theoretical formulation and experimental evidence
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Magnon-bipolar carrier drag thermopower in antiferromagnetic/ferromagnetic semiconductors: Theoretical formulation and experimental evidence

机译：Magnon-Bipolar载体拖曳热量在反铁磁/铁磁半导体中：理论配方和实验证据

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摘要

Quantized spin-wave known as magnon. a bosonic quasiparlicle. can drag electrons or holes via s-d exchange interaction and boost the thermopower over the conventional diffusive thermopower. P-type magnon-drag thermopower has been observed in both ferromagnetic and antiferromagnetic metallic and degenerate semiconductors. However, it has been less reported for intrinsic or n-type magnetic semiconductors; therefore, the impact of magnon-bipolar carrier drag on thermopower has remained unexplored. Here, a theoretical model for magnon-bipolar carrier drag thermopower is derived based on the magnon-carrier interaction lifetimes. The model predicts that the bipolar carrier drag thermopower becomes independent of both the carrier and magnon relaxation times. A proof of concept experiment is presented that confirms this prediction. We also report the observation of magnon-carrier drag thermopower in n-type and intrinsic ferromagnetic semiconductors experimentally. The p-type antiferromagnetic MnTe is doped with different amounts of Cr to produce nondegen-erate and n-type semiconductors of various carrier concentrations. Cr dopants have a donor nature and create ferromagnetic-antiferromagnetic clusters due to the Cr~(3+) oxidation state. Heat capacity measurements confirm the presence of magnons in Cr-doped MnTe. It is shown that the magnon-drag thermopower is significantly reduced for 3%-5% Cr-doped samples due to bipolar drag effects and becomes negative for 14% and 20% Cr-doped MnTe due to dominant magnon-electron drag thermopower.
机译：量化的旋转波被称为magnon。一个伴者quasiparlicle。可以通过S-D兑换相互作用拖动电子或孔，并通过传统的扩散热电器升压热电器。在铁磁和反铁磁金属和退化半导体中观察到P型Magnon-TrothimoWower。但是，对于内在或n型磁半导体，据报道较少;因此，Magnon-Bipolar载波对热电器的影响仍未开发。这里，基于MAGNON载体相互作用寿命导出MAGNON-双极载波拖曳热电机的理论模型。该模型预测双极载波热电机变得独立于载体和氧化镁弛豫时间。介绍了概念实验证明，证实了这一预测。我们还通过实验报告了N型和内在铁磁体半导体中的Magnon载体拖曳振荡器的观察。 P型反铁磁体MNTE掺杂有不同量的CR，以产生各种载流子浓度的非复年串和n型半导体。 CR掺杂剂具有捐助性，并产生由于Cr〜（3+）氧化状态而产生铁磁 - 反铁磁簇。热容量测量证实了CR掺杂MNTE中的胶质龙。结果表明，由于双极拖动效应，MAGNON-TROMMOMOWER显着降低了3％-5％CR掺杂样品，并且由于主导的MAGNON-ELECTON THERMOWOWOLE，而导致的14％和20％CR掺杂MNTE。

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  • 来源
    《Physical review》 |2020年第4期|045202.1-045202.17|共17页
  • 作者

    Mobarak Hossain Polash; Daryoosh Vashaee;

  • 作者单位

    Department of Materials Science and Engineering North Carolina State University Raleigh North Carolina 27606 USA and Department of Electrical and Computer Engineering North Carolina State University Raleigh North Carolina 27606 USA;

    Department of Materials Science and Engineering North Carolina State University Raleigh North Carolina 27606 USA and Department of Electrical and Computer Engineering North Carolina State University Raleigh North Carolina 27606 USA;

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