Abstract
Chromel–AuFe 0.07% thermocouples are widely used to measure small temperature differences down to liquid-He temperatures. In this work we present the thermopower S of two chromel–AuFe 0.07% thermocouples over an extended temperature range from 1.5 K to 200 K in magnetic fields up to 7 T. For low temperatures T < 4 K we find a sizeable field dependence of S even in small fields. Furthermore, a field of 7 T affects the thermopower considerably up to 200 K. Thus, our data demonstrate a significant field dependence of the thermopower of chromel–AuFe 0.07% thermocouples in an extended temperature and field range compared to previous works.
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