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Low Temperature Thermometry in High Magnetic Fields. II. Germanium and Platinum Resistors

 

作者: L. J. Neuringer,   A. J. Perlman,   L. G. Rubin,   Y. Shapira,  

 

期刊: Review of Scientific Instruments  (AIP Available online 1971)
卷期: Volume 42, issue 1  

页码: 9-14

 

ISSN:0034-6748

 

年代: 1971

 

DOI:10.1063/1.1684886

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The effect of static magnetic fields up to 210 kG on the characteristics of commercial germanium and platinum resistance thermometers was measured at various temperatures in the range 3.5–78 K. Measurements of the transverse (sample currentInormal to magnetic fieldH) and longitudinal (I∥H) magnetoresistance were carried out on both types of thermometers. A description is given of the dc resistance measuring technique used in these experiments. This method is a semiautomatic potentiometric scheme which increases the speed of measurement while maintaining high resolution and reasonable accuracy. The magnetoresistance of the germanium sensors was found to be large and orientation dependent over the temperature range investigated. These effects preclude the use of germanium elements, as presently fabricated, for temperature sensors in a high magnetic field environment. In the case of platinum resistance thermometers, the magnetoresistance at temperatures above 30 K is small enough so that it becomes practical to correct for it. In fact, these thermometers have been recently used in studies of the magnetic phase transitions in antiferromagnets in fields up to 200 kG.

 

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