Berlin 2018 – scientific programme
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DS: Fachverband Dünne Schichten
DS 15: Thermoelectric and Phase Change Materials
DS 15.5: Talk
Tuesday, March 13, 2018, 12:45–13:00, E 020
Thermoelectric properties of (Iron) Cobalt Monosilicide — •Lauritz Schnatmann1, Heiko Reith1, Gabi Schierning1, Kornelius Nielsch1, and Alexander Burkov2 — 1Leibniz institute for solid state and material science, Dresden, Germany — 2Ioffe institute, St. Petersburg, Russia
Good thermoelectric materials need a high electrical conductivity and a low thermal conductivity. Common thermoelectric materials at room temperature are for example Bi2Te3 or Sb2Te3, which are toxic and rare materials. Promising alternatives are the silicides, because they are non-toxic and abundant. They also show a relatively high thermoelectric performance and are possible candidates for Weyl materials. Co1-xFexSi Samples were grown by Bridgeman method. Structure and chemical analysis of the samples were made by XRD, TEM and EDX. Afterwards we performed temperature and magnetic field dependent measurements on different silicide-compositions. Thermal conductivity, Seebeck-coefficient and electrical conductivity were measured with the thermal transport option of a Dynacool system by Quantum Design. In the structure analysis we identified the B20 crystal structure in our sample with a [111] orientation perpendicular to our measurement direction. In the magnetic field dependent measurements we analyse the difference between parallel and perpendicular applied magnetic fields in respect to the measurement direction. In parallel applied field we observed a negative magneto resistance with a maximum at 50K. For a perpendicular applied field we see a positive magneto resistance.