Magetoresistance of RuO_2-based resistance thermometers below 0.3 K

Details Magetoresistance of RuO_2-based resistance thermometers below 0.3 K Magetoresistance of RuO_2-based resistance thermometers below 0.3 K

2000-07-25

arxiv.org/abs/cond-mat/0007399v3

Cryogenics 41 (2001) 143-148

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages with 7 embedded figures. Published version (very minor changes)

Scientific paper

We have determined the magnetoresistance of RuO_2-based resistors (Scientific Instruments RO-600) between 0.05 K and 0.3 K in magnetic fields up to 8 T. The magnetoresistance is negative around 0.5 T and then becomes positive at larger fields. The magnitude of the negative magnetoresistance increases rapidly as the temperature is lowered, while that of the positive magnetoresistance has smaller temperature dependence. We have also examined the temperature dependence of the resistance below 50 mK in zero magnetic field. It is described in the context of variable-range-hopping conduction down to 15 mK. Hence, the resistors can be used as thermometers down to at least 15 mK.

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