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Chromium as resonant donor impurity in PbTe

机译:铬作为PbTe中共振的施主杂质

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摘要

We synthesize and perform structural, thermoelectric, magnetic, and ~(125)Te NMR characterization measurements on chromium-doped PbTe. ~(125)Te NMR and magnetic measurements show that Pb_(1-x)Cr_xTe is a solid solution up to x = 0.4 at.% and forms an n-type dilute paramagnetic semiconductor. The Cr level is resonant and pins the Fermi level about 100 meV into the conduction band at liquid nitrogen temperatures and below, but it moves into the gap as the temperature increases to 300 K. ~(125)Te NMR spectra exhibit a Knight shift that correlates well with Hall effect measurements and resolve peaks of Te near Cr. Magnetic behavior indicates that Cr exists mainly as Cr~(2+1). No departure from the Pisarenko relation for PbTe is observed. Secondary CR_2Te_3 and Cr_(3+δ)Te)4 phases are present in samples with x > 0.4%.
机译:我们合成并执行了掺杂铬的PbTe的结构,热电,磁性和〜(125)Te NMR表征测量。 〜(125)Te NMR和磁测量表明,Pb_(1-x)Cr_xTe是固溶体,最高x = 0.4 at。%,并形成n型稀顺磁性半导体。 Cr共振,并在液氮温度及更低温度下将约100 meV的费米能级固定在导带中,但随着温度升高至300 K,它进入间隙中。〜(125)Te NMR谱图显示奈特位移与霍尔效应测量值很好地相关,并解析了Cr附近的Te峰。磁行为表明Cr主要以Cr〜(2 + 1)的形式存在。没有观察到与PbTe的Pisarenko关系背离。 x> 0.4%的样品中存在次级CR_2Te_3和Cr_(3 +δ)Te)4相。

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  • 来源
    《Physical review》 |2012年第4期|p.045210.1-045210.7|共7页
  • 作者单位

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210-1142, USA;

    Division of Materials Sciences and Engineering, Ames Laboratory US DOE, Iowa State University, Ames, Iowa, 50011, USA;

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210-1142, USA;

    Division of Materials Sciences and Engineering, Ames Laboratory US DOE, Iowa State University, Ames, Iowa, 50011, USA;

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210-1142, USA,Department of Physics, The Ohio State University, Columbus, Ohio, 43210, USA;

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  • 正文语种 eng
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  • 关键词

    other nonmetals; conductivity phenomena in semiconductors and insulators; nonmetals; nuclear magnetic resonance and relaxation;

    机译:其他非金属;半导体和绝缘体中的导电现象;非金属核磁共振与弛豫;

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