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. 1995 Mar-Apr;100(2):119–171. doi: 10.6028/jres.100.012

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 1 — Electrical resistivity ρ as a function of temperature; ρ_int is the temperature-dependent intrinsic resistivity, and ρ₀ is the residual (0 K) resistivity, due to impurities. Residual resistivity ratio RRR is defined as ρ(273 K)/ρ(4.2 K). [67] (A number in square brackets following each figure caption denotes a bibliographic reference number (Sec. 3) to the source paper.)