Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 83: Transport I

HL 83.4: Vortrag

Donnerstag, 14. März 2013, 15:45–16:00, H16

Magnetotransport measurements on nanostructured Bi_1−xSb_x alloys — •Matthias T. Elm¹, Christian H. Will¹, Bernadette Landschreiber², Ekrem Güneş², Sabine Schlecht², and Peter J. Klar¹ — ¹I. Physikalisches Institut, Justus-Liebig-Universität, Heinrich-Buff Ring 16, 35392 Gießen — ²Institut für Anorganische und Analytische Chemie, Heinrich-Buff-Ring 58, 35392 Gießen

A series of nanostructured Bi_1−xSb_x alloy samples were prepared by cold pressing of Bi and Sb nanoparticles, which were synthesized by mechanical alloying. The Sb content in the alloys varied between 0% to 50%. Increasing the Sb content strongly influences the band structure resulting in a change of the transport behavior from semi-metallic to semiconducting behavior with a maximum band gap of 41.5 meV at a Sb concentration of around 14% determined from temperature-dependent resistivity measurements. At even higher Sb concentrations the transport behavior becomes semi-metallic again. The change of the band structure was investigated by magnetotransport measurements at a temperature of 30 K in magnetic fields up to 10 T. Using a three band model and taking into account the influence of the magnetic field on the band structure it was possible to describe the magnetic-field induced changes of the magnetoresistance as well as the Hall-constant of the different samples.