Computer control of a slow-AC technique for thermopower measurements

Author

Marcy, Henry O. ; Marks, Tobin J. ; Kannewurf, Carl R.

Author_Institution

Northwestern Univ., Evanston, IL, USA

Volume

39

Issue

5

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

756

Lastpage

760

Abstract

A measurement algorithm and the required instrumentation for computer automation of temperature-dependent thermopower measurements over the range of 4.2 to 350 K are described. The performance of the measurement system is demonstrated by examining typical results obtained on bulk and thin film samples of the thallium-based ceramic superconductor. The quality of the measurement data obtained is improved by increasing the density of the collected data and by improving reproducibility of the results

Keywords

barium compounds; calcium compounds; computerised control; computerised instrumentation; electric variables measurement; high-temperature superconductors; thallium compounds; thermoelectricity; 4.2 to 350 K; Tl-Ba-Ca-Cu-O; bulk simple; ceramic superconductor; computer automation; computerised instrumentation; data acquisition; high temperature superconductor; reproducibility; thermoelectric power; thermopower; thin film samples; Automatic control; Automation; Charge measurement; Conductivity measurement; Current measurement; Electrical resistance measurement; Temperature dependence; Temperature distribution; Temperature measurement; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.58621

Filename

58621