Chromium as resonant donor impurity in PbTe

M. D. Nielsen, E. M. Levin, C. M. Jaworski, K. Schmidt-Rohr, and J. P. Heremans
Phys. Rev. B 85, 045210 – Published 25 January 2012

Abstract

We synthesize and perform structural, thermoelectric, magnetic, and 125Te NMR characterization measurements on chromium-doped PbTe. 125Te NMR and magnetic measurements show that Pb1xCrxTe 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%.

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  • Received 25 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.045210

©2012 American Physical Society

Authors & Affiliations

M. D. Nielsen1, E. M. Levin2, C. M. Jaworski1, K. Schmidt-Rohr2, and J. P. Heremans1,3,*

  • 1Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210-1142, USA
  • 2Division of Materials Sciences and Engineering, Ames Laboratory US DOE, Iowa State University, Ames, Iowa, 50011, USA
  • 3Department of Physics, The Ohio State University, Columbus, Ohio, 43210, USA

  • *Corresponding author: heremans.1@osu.edu

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Issue

Vol. 85, Iss. 4 — 15 January 2012

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