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

Hong Chang; Xin Gui; Silu Huang; Roshan Nepal; Ramakanta Chapai; Lingyi Xing; Weiwei Xie; Rongying Jin

doi:10.1088/1367-2630/ab0227

Mn-induced ferromagnetism and enhanced thermoelectric properties in Ru_1-xMn_xSb_2+δ

Hong Chang, Xin Gui, Silu Huang, Roshan Nepal, Ramakanta Chapai, Lingyi Xing, Weiwei Xie, Rongying Jin

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

1 Scopus citations

Abstract

We report the experimental investigation of Mn doping effect on the electrical, magnetic, and thermal properties of Ru_1-xMn_xSb_2+δ single crystals. While RuSb_2+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 μV 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 Ru_1-xMn_xSb_2+δ.

Original language	American English
Article number	033008
Journal	New Journal of Physics
Volume	21
Issue number	3
DOIs	https://doi.org/10.1088/1367-2630/ab0227
State	Published - Mar 15 2019
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

Keywords

ferromagnetism
single crystal
thermoelectric properties

Access to Document

10.1088/1367-2630/ab0227

Cite this

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title = "Mn-induced ferromagnetism and enhanced thermoelectric properties in Ru1-xMnxSb2+δ",

abstract = "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 μV 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.",

keywords = "ferromagnetism, single crystal, thermoelectric properties",

author = "Hong Chang and Xin Gui and Silu Huang and Roshan Nepal and Ramakanta Chapai and Lingyi Xing and Weiwei Xie and Rongying Jin",

note = "Publisher Copyright: {\textcopyright} 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.",

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T1 - Mn-induced ferromagnetism and enhanced thermoelectric properties in Ru1-xMnxSb2+δ

AU - Chang, Hong

AU - Gui, Xin

AU - Huang, Silu

AU - Nepal, Roshan

AU - Chapai, Ramakanta

AU - Xing, Lingyi

AU - Xie, Weiwei

AU - Jin, Rongying

PY - 2019/3/15

Y1 - 2019/3/15

N2 - 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 μV 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.

AB - 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 μV 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.

KW - ferromagnetism

KW - single crystal

KW - thermoelectric properties

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