Experimental setup for the measurement of the thermoelectric power in zero and applied magnetic field

TitleExperimental setup for the measurement of the thermoelectric power in zero and applied magnetic field
Publication TypeJournal Article
Year of Publication2010
AuthorsMun E, Bud'ko SL, Torikachvili MS, Canfield PC
Journal TitleMeasurement Science & Technology
Volume21
Pages055104
Date Published05/01
ISBN Number0957-0233
Accession NumberISI:000276631600025
KeywordsCALIBRATION, LA-ND, measurement setup, RAGSB2 R, SM, thermoelectric power, thermopower
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+delta high-T-c 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 mu V 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.

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