Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 81: Correlated Electrons: Other Materials
TT 81.5: Talk
Thursday, March 12, 2026, 16:15–16:30, HSZ/0101
Separating magnetic bulk and surface properties of Czochralski-grown FeSi — •Gilles Gödecke1, Philipp Herre1, Markus Etzkorn2, 3, Musfira Aqeel2, 3, Alexander Frantz4, Dirk Baabe4, Stefan Süllow1, and Dirk Menzel1, 2 — 1Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 2Laboratory for Emerging Nanometrology, TU Braunschweig, Germany — 3Institut für Angewandte Physik, TU Braunschweig, Germany — 4Institut für Anorganische und Analytische Chemie, TU Braunschweig, Germany
The narrow-gap semiconductor FeSi has been extensively discussed regarding its low-temperature electronic transport and magnetic properties, ranging from Kondo-insulating behavior to the emergence of conducting and magnetic surface states. We present resistivity measurements on FeSi single crystals grown by the Czochralski method. To separate bulk and surface contributions, the sample thickness is continuously decreased by polishing. In addition, we conduct magnetization measurements of FeSi powder samples with decreasing grain sizes prepared by ball milling. The increase of the surface-to-volume ratio leads to enhanced surface contributions in the conductivity and magnetization. The results enable us to distinguish between the electrical and magnetic bulk and surface contributions and further estimate the dimensions of the surface states.
Keywords: FeSi; surface states; magnetometry