TY - JOUR
T1 - A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride
AU - Chi, Hang
AU - Tan, Gangjian
AU - Kanatzidis, Mercouri G.
AU - Li, Qiang
AU - Uher, Ctirad
N1 - Funding Information:
The work was supported by the Revolutionary Materials for Solid State Energy Conversion, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0001054. A part of transport property measurements was performed by H.C. and Q.L. at Brookhaven National Laboratory, which was supported by the U.S. Department of Energy, Office of Basic Energy Science, Materials Sciences and Engineering Division, under Contract No. DE-SC00112704.
Publisher Copyright:
© 2016 Author(s).
PY - 2016/5/2
Y1 - 2016/5/2
N2 - SnTe is renowned for its promise in advancing energy-related technologies based on thermoelectricity and for its topological crystalline insulator character. Here, we demonstrate that each Mn atom introduces ∼4 μB (Bohr magneton) of magnetic moment to Sn1- xMnxTe. The Curie temperature TC reaches ∼14 K for x = 0.12, as observed in the field dependent hysteresis of magnetization and the anomalous Hall effect. In accordance with a modified two-band electronic Kane model, the light L-valence-band and the heavy Σ-valence-band gradually converge in energy with increasing Mn concentration, leading to a decreasing ordinary Hall coefficient RH and a favorably enhanced Seebeck coefficient S at the same time. With the thermal conductivity κ lowered chiefly via point defects associated with the incorporation of Mn, the strategy of Mn doping also bodes well for efficient thermoelectric applications at elevated temperatures.
AB - SnTe is renowned for its promise in advancing energy-related technologies based on thermoelectricity and for its topological crystalline insulator character. Here, we demonstrate that each Mn atom introduces ∼4 μB (Bohr magneton) of magnetic moment to Sn1- xMnxTe. The Curie temperature TC reaches ∼14 K for x = 0.12, as observed in the field dependent hysteresis of magnetization and the anomalous Hall effect. In accordance with a modified two-band electronic Kane model, the light L-valence-band and the heavy Σ-valence-band gradually converge in energy with increasing Mn concentration, leading to a decreasing ordinary Hall coefficient RH and a favorably enhanced Seebeck coefficient S at the same time. With the thermal conductivity κ lowered chiefly via point defects associated with the incorporation of Mn, the strategy of Mn doping also bodes well for efficient thermoelectric applications at elevated temperatures.
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U2 - 10.1063/1.4948523
DO - 10.1063/1.4948523
M3 - Article
AN - SCOPUS:84968845903
VL - 108
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 18
M1 - 182101
ER -