Chromium as resonant donor impurity in PbTe
Chromium as resonant donor impurity in PbTe
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DOI：
10.1103/physrevb.85.045210
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发表时间：
2012-01
影响因子：
3.7
通讯作者：
Michele D. Nielsen;E. M. Levin;C. M. Jaworski;K. Schmidt-Rohr;J. Heremans
中科院分区：
文献类型：
--
作者：
Michele D. Nielsen;E. M. Levin;C. M. Jaworski;K. Schmidt-Rohr;J. Heremans
我们合成并进行结构，热电，磁，和125碲NMR表征测量铬掺杂碲化铅。125 Te NMR和磁性测量表明Pb 1 −xCrxTe在x = 0.4at.%以下为固溶体并形成n型稀顺磁半导体。Cr能级是共振的，并且在液氮温度及以下将约100 meV的费米能级钉扎到导带中，但是当温度升高到300 K时，它移动到差距中。125 Te NMR谱表现出与霍尔效应测量良好相关的奈特位移，并分辨出Cr附近的Te峰。磁性研究表明，Cr主要以Cr ~（2+）的形式存在。没有偏离Pisarenko关系的PbTe观察。当x > 0.4%时，样品中存在二次Cr2 Te 3和Cr 3 +δ Te 4相。
We synthesize and perform structural, thermoelectric, magnetic, and 125Te NMR characterization measurements on chromium-doped PbTe. 125Te NMR and magnetic measurements show that Pb1−xCrxTe 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. 125Te 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 Cr2+. No departure from the Pisarenko relation for PbTe is observed. Secondary Cr2Te3 and Cr3+δTe4 phases are present in samples with x > 0.4%.