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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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HL: Fachverband Halbleiterphysik

HL 40: Thermal, acoustic and transport properties

HL 40.4: Talk

Wednesday, March 18, 2020, 10:15–10:30, POT 151

Transport properties of natural and synthetic FeAsxS2−x (0 ≤ x ≤ 0.01) pyrites — •Esteban Zuñiga-Puelles1,2, Raul Cardoso-Gil2, Matej Bobnar2, Igor Veremchuk2, Cameliu Himcinschi1, Jens Kortus1, and Roman Gumeniuk11TU Bergakademie Freiberg, Freiberg, Germany — 2Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden

Synthetic polycrystalline and natural (Schönbrunn mine, Saxony, Germany) pyrites show comparable electrical resistivities (corresponding to the energy gaps ∼  0.7-0.9  eV) and Seebeck coefficients (-350 to -400 µV K−1 at 600  K). On the other hand, their thermal conductivities are similar (i.e. nearly temperature independent ∼40-20  W  m−1  K−1) above 200  K. Below this temperature natural pyrite reveal a strong and well pronounced maximum, which became strongly reduced in synthetic samples. Such an effect is caused by much smaller grain size (≤ 100 µm) in synthetic FeS2, which results in additional scattering mechanisms (i.e. on point defect and/or grain boundaries). Therefore, mineral from Schönbrunn is further considered as a model system.

Interestingly, electrical transport properties of pyrites from other mines in Saxony varies from metallic (n-type conductivity) to semiconducting (p-type conductors). To shed light on such a behavior, FeAsxS2−x (0 ≤ x ≤ 0.01) compounds were synthesized. The increase of As-content x in this system results in a decrease of the electrical resistivity as well as in the shift of the type of conducting mechanism towards hole-like one.

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