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Magnetotransport and thermopower of single Bi 0.92 Sb 0.08 nanowires
Author(s) -
Heiderich Sonja,
Toellner William,
Boehnert Tim,
Gluschke Jan Goeran,
Zastrow Sebastian,
Schumacher Christian,
Pippel Eckhard,
Nielsch Kornelius
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201308004
Subject(s) - seebeck coefficient , nanowire , magnetoresistance , materials science , annealing (glass) , electrical resistivity and conductivity , condensed matter physics , atmospheric temperature range , thermoelectric effect , temperature coefficient , analytical chemistry (journal) , nanotechnology , magnetic field , chemistry , composite material , thermal conductivity , thermodynamics , electrical engineering , physics , engineering , chromatography , quantum mechanics
This Letter reports on temperature‐dependent electrical measurements of single Bi 0.92 Sb 0.08 nanowires with diameters between 220 nm and 350 nm. The magnetoresistance effect under transverse magnetic fields of ±2 T and the Seebeck coefficient S are measured in the temperature range of 50–300 K. Additionally, the influence of an annealing step on the transport properties is investigated. The as‐prepared wires show heterogeneous temperature dependent behavior, whereas the annealed wires show semiconductive behavior. The room temperature value of the resistivity of the wires is between 2 × 10 –6 Ωm and 1.4 × 10 –5 Ωm. Magnetoresistance effects up to 15% at 50 K for the as‐prepared nanowires and up to 23% for the annealed wires are observed. The temperature dependent Seebeck coefficient of single wires is determined. The as‐prepared wires show a rise of the absolute value of S with temperature and it seems to saturate at room temperature. In contrast to this, the annealed wires show a linear increase of S . The room temperature values of S are –55 µV K –1 and –45 µV K –1 , respectively. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)