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A3: High temperature materials

Negative magnetoresistance and s-f scattering in Pb1-xEuxSe

Sunphil Kim1, Yibin Gao1, Bin He1, Gloria Lehr3, Yeseul Lee4, Mercouri G. Kanatzidis4, Donald T. Morelli3, and Joseph P. Heremans1,2
1.Department of Mechanical & Aerospace Engineering 2.Department of Physics,Ohio State University 3.Department of Chemical Engineering and Materials Science,Michigan State University 4.Department of Chemistry,Northwestern University

PbSe is cost effective over PbTe and  has been a good potential p-type thermoelectric material, showing zT >1.(1)  Recently, highly efficient thermoelectric materials have been reported with nano scattering technique. So, in this study, we selected EuSe as the nano scattering agent. Another advantage of using EuSe is that it increases the band gap which is favorable to high temperature application.(2)
Here, we synthesize and characterize p-type doped  Pb1-xEuxSe :Na(1%) and Pb0.99-yEu0.01Se: Na(y%)   using combination of co-melting and Spark Plasma Sintering methods. Thermoelectric , thermomagnetic, and galvanomagnetic properties (electrical resistivity, Seebeck, Hall, and Nernst coefficients) are measured and reported, along with Magnetization and Magnetoresistance. We found out that magnetic scattering is dominant in Pb1-xEuxSe, showing negative magnetoresistance.

 This work was supported as part of the “Revolutionary Materials for Solid State Energy Conversion (RMSSEC),” an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science.
 
(1) Yeseul Lee et al., J. Am. Chem. Soc. 135, 2013, 5152-5160
(2)Arnim Lambrecht et al., J. Cryst. Growth 108, 1991, 301-308