Low-temperature characteristics of Matsushita carbon resistors with and without magnetic fields

Y. Koike, T. Fukase, S. Morita, M. Okamura, N. Mikoshiba

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21 Citations (Scopus)

Abstract

The resistance versus temperature (RT) characteristics and magnetoresistance (MR) of 1/8 W nominal 68 Ω and 100 Ω Matsushita carbon resistors of grade ERC-18SG have been measured at temperatures between 8 and 0.05 K, in magnetic fields up to 84kOe (84 × 106/4 π Am-1). In both carbon resistors, the RT behaviour is expressed as R(T) = R2exp{(T2/T)1/2} in the high temperature region and as R(T) = R4exp{(T4/T)1/4} in the low temperature region. These relationships are explained as due to variable-range hopping conduction with and without the changing energy between isolated metallic grains, respectively. Negative and positive MR's have been observed in low and high magnetic fields, respectively. The negative MR increases with decreasing temperature at very low temperatures < 0.1 K. These phenomena are discussed in terms of the theory based on the strong Anderson localization.

Original languageEnglish
Pages (from-to)499-502
Number of pages4
JournalCryogenics
Volume25
Issue number9
DOIs
Publication statusPublished - 1985 Sep

Keywords

  • carbon resistors
  • low temperature characteristics
  • magnetic fields

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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