Journal
PHYSICAL REVIEW B
Volume 85, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.045210
Keywords
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Funding
- ZT: Plus, Azusa, California
- US National Science Foundation/Department of Energy [NSF-CBET-1048622]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- US Department of Energy by Iowa State University [DE-AC02-07CH11358]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1048622] Funding Source: National Science Foundation
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We synthesize and perform structural, thermoelectric, magnetic, and (TeNMR)-Te-125 characterization measurements on chromium-doped PbTe. Te-125 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. Te-125 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+delta Te4 phases are present in samples with x > 0.4%.
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