Quasiequilibrium determination of high‐Tcsuperconductor transition temperatures
作者:
Michael J. Pechan,
Jonathan A. Horvath,
期刊:
American Journal of Physics
(AIP Available online 1990)
卷期:
Volume 58,
issue 7
页码: 642-644
ISSN:0002-9505
年代: 1990
DOI:10.1119/1.16424
出版商: American Association of Physics Teachers
关键词: TRANSITION TEMPERATURE;ACCURACY;YTTRIUM OXIDES;BARIUM OXIDES;COPPER OXIDES;BENCH−SCALE EXPERIMENTS;LOW TEMPERATURE;NITROGEN;SUPERCONDUCTORS
数据来源: AIP
摘要:
A fast and inexpensive method for making accurate determinations of transition temperatures above 77 K in superconducting oxides is presented. The technique is based upon cooling in liquid nitrogen, then warming the sample in the vapors above the liquid level inside a standard glass or stainless steel vacuum bottle. Proper sample support and placement of the thermocouple, key elements in this technique, are discussed. Once pads have been placed on the sample,Tccan be determined, to an accuracy of ±1 K, within 15 min. Due to its speed, accuracy, and low cost, this technique is well suited for application in an advanced undergraduate laboratory experiment.
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