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

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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.

Original languageEnglish
Article number182101
JournalApplied Physics Letters
Issue number18
Publication statusPublished - May 2 2016


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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