Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Applied physics letters, 2016-05, Vol.108 (18)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2016

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• 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 Sn1− x Mn x Te. 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.