A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride

Hang Chi; Gangjian Tan; Mercouri G. Kanatzidis; Qiang Li; Ctirad Uher

doi:10.1063/1.4948523

A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride

Hang Chi^*, Gangjian Tan, Mercouri G. Kanatzidis, Qiang Li, Ctirad Uher

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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 μ_B (Bohr magneton) of magnetic moment to Sn_1- _xMn_xTe. The Curie temperature T_C 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 R_H 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.

Original language	English (US)
Article number	182101
Journal	Applied Physics Letters
Volume	108
Issue number	18
DOIs	https://doi.org/10.1063/1.4948523
State	Published - May 2 2016

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4948523

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title = "A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride",

abstract = "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.",

author = "Hang Chi and Gangjian Tan and Kanatzidis, {Mercouri G.} and Qiang Li and Ctirad Uher",

note = "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.",

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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.

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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