氦气压力下高分辨率热膨胀测量
High-resolution thermal expansion measurements under Helium-gas pressure
摘要：
我们报告实现的电容式温度计，设计用于高分辨率测量的长度变化的材料的温度为1.4 K $\leq T \leq$ 300 K和静水压力$P \leq$ 250 MPa。氦气（$^4$ He）用作压力传递介质，确保流体静压条件。特别强调的是，在温度扫描期间，要保证良好的近似恒压条件。通过在压力$P \simeq$ 0.1 MPa（环境压力）和104 MPa下对蓝铜矿单晶Cu $_3$（CO $_3$）$_2$（OH）$_2$（准一维自旋S = 1/2海森堡反铁磁体）的热膨胀系数的测量来证明膨胀计的性能。结果表明，在这个系统中的磁相互作用的压力的强烈影响。
英文摘要：
We report on the realization of a capacitive dilatometer, designed for high-resolution measurements of length changes of a material for temperatures 1.4 K $\leq T \leq$ 300 K and hydrostatic pressure $P \leq$ 250 MPa. Helium ($^4$He) is used as a pressure-transmitting medium, ensuring hydrostatic-pressure conditions. Special emphasis has been given to guarantee, to a good approximation, constant-pressure conditions during temperature sweeps. The performance of the dilatometer is demonstrated by measurements of the coefficient of thermal expansion at pressures $P \simeq$ 0.1 MPa (ambient pressure) and 104 MPa on a single crystal of azurite, Cu$_3$(CO$_3$)$_2$(OH)$_2$, a quasi-one-dimensional spin S = 1/2 Heisenberg antiferromagnet. The results indicate a strong effect of pressure on the magnetic interactions in this system.
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