A compact capacitive dilatometer for thermal expansion and magnetostriction measurements at millikelvin temperatures

作者：Abe Satoshi^*; Sasaki Fumishi; Oonishi Takanobu; Inoue Daiki; Yoshida Jun; Takahashi Daisuke; Tsujii Hiroyuki; Suzuki Haruhiko; Matsumoto Koichi

来源：Cryogenics, 2012, 52(10): 452-456.

DOI：10.1016/j.cryogenics.2012.04.008

• Thermal expansion
• Magnetostriction
• Capacitive dilatometer
• Capacitance bridge
• Low temperatures

We describe a compact capacitive dilatometer for measuring thermal expansion and magnetostriction below 1 K using a home-made capacitance bridge with long-term stability of Delta C/C similar to 1.6 x 10(-7). We measured the thermal expansion and magnetostriction of a heavy-Fermion compound CeRu2Si2 and those of a standard copper sample to clarify the dilatometer cell effect. The temperature-dependent cell effect of our dilatometer, Delta L/L, was less than 10(-8) below 0.2 K. The magnetic-field-dependent cell effect was not observed below 52.6 mT at 85 mK, and was less than -2 x 10(-9) up to 10 T at 4.2 K. Our dilatometer provides precise thermal expansion and magnetostriction measurements at millikelvin temperatures.

• 出版日期2012-10