Dielectric Low Temperature Thermometer for Use in High Magnetic Fields. I. KCl : Li
作者:
R. A. Brand,
S. A. Letzring,
H. S. Sack,
W. W. Webb,
期刊:
Review of Scientific Instruments
(AIP Available online 1971)
卷期:
Volume 42,
issue 7
页码: 927-930
ISSN:0034-6748
年代: 1971
DOI:10.1063/1.1685308
出版商: AIP
数据来源: AIP
摘要:
The temperature dependence of the dielectric constant of KCl crystals doped with Li+ions has been shown to provide a useful measure of temperature over the range of 1–30 K, that is (at least between 1–10 K), independent of magnetic fields up to at least 100 kOe. The magnetic field dependence, measured by calibrating the thermometer at zero, then at high field, is immeasurably small and certainly less than the absolute temperature uncertainty (about 0.2%) at 4.2 K. The capacitanceCvaries with temperatureTapproximately asC=A+B/T, whereAandBare positive constants. For a thermometer withA∼30 pF andB∼15 pF·deg the sensitivity &dgr; lnC/&dgr; lnT=−B/(AT+B) is about 0.3 at 1 K. Using a GR type 1615 A bridge a sensitivity of 0.3 mK at 1 K, and of 3.6 mK at 4.2 K was obtained. The thermometer calibration is reproducible to better than 0.2% on cycling between room temperature and helium temperature. A long range stability problem, possibilities for higher sensitivities, other geometric arrangements, and similar further development questions are briefly mentioned.
点击下载:
PDF
(315KB)
返 回