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A low-temperature study of manganese-induced ferromagnetism and valence band convergence in tin telluride [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 182,101 : digital, PDF file
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this study, 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 temperatureTC reaches ~14K 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 conductivityκ 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.
Report Numbers
E 1.99:bnl--112117-2016-ja
bnl--112117-2016-ja
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Note
Published through SciTech Connect.
05/02/2016.
"bnl--112117-2016-ja"
"KC0202050"
Applied Physics Letters 108 18 ISSN 0003-6951; APPLAB AM
Hang Chi; Gangjian Tan; Mercouri G. Kanatzidis; Qiang Li; Ctirad Uher.
Funding Information
SC0012704
MA012MACA
View MARC record | catkey: 23758834