Mn-induced ferromagnetism and enhanced thermoelectric properties in Ru1−xMnxSb2+δ

We report the experimental investigation of Mn doping effect on the electrical, magnetic, and thermal properties of Ru1−xMnxSb2+δ single crystals. While RuSb2+δ is a diamagnetic semiconductor, partial replacement of Ru by Mn results in ferromagnetism with the Curie temperature 536 K and 540 K for x...

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Published inNew journal of physics Vol. 21; no. 3; pp. 033008 - 33013
Main Authors Chang, Hong, Gui, Xin, Huang, Silu, Nepal, Roshan, Chapai, Ramakanta, Xing, Lingyi, Xie, Weiwei, Jin, Rongying
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 15.03.2019
Subjects
Curie temperature
Diamagnetism
Doping
Electrical resistivity
Electronic structure
Ferromagnetism
Magnetic properties
Physics
single crystal
Single crystals
Thermal conductivity
Thermodynamic properties
thermoelectric properties
Thermoelectricity
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Summary:We report the experimental investigation of Mn doping effect on the electrical, magnetic, and thermal properties of Ru1−xMnxSb2+δ single crystals. While RuSb2+δ is a diamagnetic semiconductor, partial replacement of Ru by Mn results in ferromagnetism with the Curie temperature 536 K and 540 K for x = 0.04 and 0.08, respectively. Correspondingly, the electrical resistivity decreases dramatically and shows metallic character due to the increased electron concentration. Surprisingly, the magnitude of the thermopower increases upon Mn doping, reaching −250 V K−1 at 300 K for x = 0.08, while the thermal conductivity remains unchanged above 100 K. These indicate a strong modification of electronic structure by doped Mn, leading to enhanced thermoelectric properties. The carriers induced by Mn not only decrease the resistivity, but also mediate the long-range ferromagnetic ordering in Ru1−xMnxSb2+δ.
Bibliography:NJP-109444.R3
ISSN:1367-2630
DOI:10.1088/1367-2630/ab0227