Scholarlink

<p>CaMnO<sub>3</sub>, a perovskite manganite known for its antiferromagnetic (AFM) and other physical properties, has underexplored transport properties and temperature coefficient of resistance (TCR). We report exceptional charge transport phenomena in orthorhombic CaMnO<sub>3</sub>, revealing a record negative temperature coefficient of resistance (TCR =  − 31.8% K⁻<sup>1</sup> at 21&#xa0;K) for antiferromagnetic insulators. Magnetic characterization shows a Néel temperature (T<sub>N</sub>) of 81.5&#xa0;K. This magnetic transition govern distinct charge transport regimes, variable-range hopping (VRH) below T<sub>N</sub> and small polaron (SP) conduction above T<sub>N</sub>, demonstrating the existence of magnetic-electric coupling. Remarkably, the material exhibits field-independent TCR stability up to 6&#xa0;T and significant magnetoresistance (MR =  − 17.5% at 22&#xa0;K). These findings demonstrate CaMnO<sub>3</sub> potential for antiferromagnetic spintronic applications, particularly in magnetic sensors and spin-engineered thermal detection technologies in extreme environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Giant Negative Temperature Coefficient of Resistance and Magnetotransport in Antiferromagnetic CaMnO3

  • 期刊论文

  • 发表日期：

    2025年6月26日

查看全文
  • Haochen Wang,
  • Gefei Lu,
  • Weishi Tan,
  • Junran Li,
  • Kunpeng Su,
  • Shuai Huang,
  • Lin Yang,
  • Haiou Wang

摘要

CaMnO3, a perovskite manganite known for its antiferromagnetic (AFM) and other physical properties, has underexplored transport properties and temperature coefficient of resistance (TCR). We report exceptional charge transport phenomena in orthorhombic CaMnO3, revealing a record negative temperature coefficient of resistance (TCR =  − 31.8% K⁻1 at 21 K) for antiferromagnetic insulators. Magnetic characterization shows a Néel temperature (TN) of 81.5 K. This magnetic transition govern distinct charge transport regimes, variable-range hopping (VRH) below TN and small polaron (SP) conduction above TN, demonstrating the existence of magnetic-electric coupling. Remarkably, the material exhibits field-independent TCR stability up to 6 T and significant magnetoresistance (MR =  − 17.5% at 22 K). These findings demonstrate CaMnO3 potential for antiferromagnetic spintronic applications, particularly in magnetic sensors and spin-engineered thermal detection technologies in extreme environments.