Experimental setup of a cryostat using a GM cryocooler. The inset shows an enlarged view of the sample stage and sample holder for measuring the Seebeck and Nernst coefficients of a single crystal of bismuth.
Time series of the temperature of a copper block attached to a GM cryocooler without using a heater; 0.5- and 1.0-mm-thick FRP dampers inserted between the GM cooler head and the copper block (see Fig. 1).
Time series of the sample stage temperature using 4.200 0 K temperature feedback with the heater for no FRP damper, 0.76- and 0.96-mm-thick FRP dampers between the sample stage and the sample holder, with a 0.5-mm-thick FRP damper inserted between the GM cooler head and the copper block. The temperature of the copper block was controlled to be 3.800 0 K.
Normalized frequency distribution of setting 4.200 0 K with no FRP damper and with a 0.76- and 0.96-mm-thick FRP damper between the sample stage and the sample holder based on the data shown in Fig. 3. Dotted lines indicate the calculated normal distributions.
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