Dresden 2026 – wissenschaftliches Programm
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FM: Fachverband Funktionsmaterialien
FM 9: Focus Session: Materials Discovery II – High throughput searches for functional magnetic materials (joint session FM/MA)
FM 9.3: Vortrag
Dienstag, 10. März 2026, 14:45–15:00, BEY/0138
Magnetism and electrical and thermal transport in the natural Fe1−xMnxWO4 (x=0.2) mineral from Potosí, Bolivia — •Skachko Dmytro1, Bohdan Kundys2, Volodymyr Levytskyi1, Esteban Zuñiga-Puelles1, Andreas Leithe-Jasper3, and Roman Gumeniuk1 — 1Institut für Experimentelle Physik, TU Bergakademie Freiberg, 09596 Freiberg, Germany — 2Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg F-67000, France — 3Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany
The natural ferberite single crystal of Fe0.8Mn0.2WO4 composition with the monoclinic NiWO4-type structure (P2/c) [a = 4.74751(6) Å, b = 5.71335(7) Å, c = 4.96847(5) Å, β = 90.15(1)∘] reveals multiple magnetic transitions at TN1 = 67(1) K, TN2 = 28(3) K, TN1cp= 66(1) K and TN2cp= 8(1) K. The reduced magnetic entropy of ≈ Rln3 observed near TN1 indicates the simplified LS-coupling scheme to fail in the description of complex magnetic behavior of the studied ferberite. The temperature dependence of electrical resistivity [ρ(T)] shows a semiconducting exponential decay saturating at ≈ 300 K. The activation energy of the decay is found to be ≈310 meV. Temperature dependence of thermal conductivity [κ(T)] is characterized by a well defined maximum at ≈68 K, which is described by the Debye-Callaway model, pointing to the dominance of phonon scattering on defects and umklapp processes. Despite revealing relatively low κ(T) and high Seebeck coefficient Fe0.8Mn0.2WO4 is rather poor thermoelectric material because of enhanced ρ(T).
Keywords: semiconductors; electrical transport; thermal transport; magnetism; crystal structure