Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

3-26-2010

Journal or Book Title

Measurement Science and Technology

Volume

21

Issue

5

First Page

055104

DOI

10.1088/0957-0233/21/5/055104

Abstract

An experimental setup was developed for the measurement of the thermoelectric power (TEP, Seebeck coefficient) in the temperature range from 2 to 350 K and magnetic fields up to 140 kOe. The system was built to fit in a commercial cryostat and is versatile, accurate and automated; using two heaters and two thermometers increases the accuracy of the TEP measurement. High density data of temperature sweeps from 2 to 350 K can be acquired within 16 h and high density data of isothermal field sweeps from 0 to 140 kOe can be obtained within 2 h. Calibrations for the system have been performed on a platinum wire and Bi2Sr2CaCu2O8 + δ high-Tc superconductors. The measured TEP of phosphor bronze (voltage lead wire) turns out to be very small; the absolute TEP value of the phosphor bronze wire is much less than 0.5 µV K−1 below 80 K. For copper and platinum wires measured against the phosphor bronze wire, the agreement between measured results and the literature data is good. To demonstrate the applied magnetic field response of the system, we report measurements of the TEP on single crystal samples of LaAgSb2 and CeAgSb2 in fields up to 140 kOe.

Comments

This is a peer-reviewed, un-copyedited version of an article accepted for publication/published in Measurement Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at DOI: 10.1088/0957-0233/21/5/055104. Posted with permission.

Copyright Owner

IOP Publishing Ltd

Language

en

File Format

application/pdf

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