Polaronic transport and thermoelectricity in Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub> single crystals [electronic resource]
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2021.
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| Abstract: | Here, we carried out a comprehensive study of the structural, electrical transport, thermal, and thermodynamic properties in ferrimagnetic Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub> single crystals. Mn and Te K -edge x-ray absorption spectroscopy and synchrotron powder x-ray diffraction were measured to provide information on the local atomic environment and the average crystal structure. The dc and ac magnetic susceptibility measurements indicate a second-order paramagnetic to ferrimagnetic transition at T<sub>c</sub> ̃ 74 K, which is further confirmed by the specific heat measurement. Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub> exhibits semiconducting behavior along with a large negative magnetoresistance of -87% at T<sub>c</sub> and a relatively high value of thermopower up to ̃10 mV/K at 5 K. Besides the rapidly increasing resistivity ?(T) and thermopower S(T) below 20 K, the large discrepancy between the activation energy for resistivity E<sub>?</sub> and thermopower E<sub>S</sub> above 20 K indicates the polaronic transport mechanism. Furthermore, the thermal conductivity ?(T) of Mn<sub>3</sub>Si<sub>2</sub>Te<sub>6</sub> is notably rather low, comparable to Cr<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub>, and is strongly suppressed in the magnetic field across T<sub>c</sub>, indicating the presence of strong spin-lattice coupling, also similar with Cr<sub>2</sub>Si<sub>2</sub>Te<sub>6</sub> |
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| Item Description: | Published through Scitech Connect. 06/14/2021. "BNL-221781-2021-JAAM." "LA-UR-21-25285." "Journal ID: ISSN 2469-9950." ": US2212861." Liu, Yu ; Hu, Zhixiang ; Abeykoon, Milinda ; Stavitski, Eli ; Attenkofer, Klaus ; Bauer, Eric D. ; Petrovic, Cedomir ; |
| Physical Description: | Size: Article No. 245122 : digital, PDF file. |