Peculiarities of thermopower in Bi microwires at low temperatures
Year: 2005
Type: article
Abstract: The temperature dependence (4.2–300 K) of the thermopower of thin Bi wires was investigated. The cylindrical Bi crystals ranging in size from 0.19 to 3 µm were prepared by high‐frequency liquid‐phase casting in a glass capillary. The nanowires are single crystal and are oriented with the (1011) crystalline axis along the wire axis. For temperatures below ∼12 K the thermopower is dominated by phonon drag and a maximum is observed at around 6 K. The position of this maximum and its value depends on the wire's diameter and the length of the samples. In the temperature range 8–11 K the phonon‐drag contribution follows an exponential temperature dependence that is characteristic of a two‐stage mechanism. The positive thermopower maxima of the order of 10 µV K–1 are explained in terms of the phonon drag of carriers. Several mechanisms that may account for the data are discussed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Source: physica status solidi (b)
Authors: D. Gitsu, T. Huber, L. Konopko, A. Nikolaeva
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1990571095