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arXiv cond-mat/0303457cond-mat.str-el
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高压低温交流量热法

AC-Calorimetry at High Pressure and Low Temperature

Heribert Wilhelm

摘要:

讨论了适应高压实验需要的交流量热技术的最新发展。用Bridgman型压室和金刚石对顶压室在0.1 K &lt; T ~ 1.5 K的温度范围内半定量测量比热是可能< 10 K. The pressure transmitting medium used to ensure good pressure conditions determines to a great extent via its thermal conductivity the operating frequency and thus the accessible temperature range. Investigations with different pressure transmitting media for T >的,固体He的截止频率比滑石的高得多。低于1 K和压力高于10 GPa的实验清楚地表明,可以测量比热的线性温度系数的压力依赖性。这是在定性协议的相关数量获得准同时通过电阻率测量相同的样品。

英文摘要:

Recent developments of the AC-calorimetric technique adapted for the needs of high pressure experiments are discussed. A semi-quantitative measurement of the specific heat with a Bridgman-type of pressure cell as well as a diamond anvil cell is possible in the temperature range 0.1 K < T < 10 K. The pressure transmitting medium used to ensure good pressure conditions determines to a great extent via its thermal conductivity the operating frequency and thus the accessible temperature range. Investigations with different pressure transmitting media for T > 1.5 K reveal for solid He a cut-off frequency which is considerably higher than for steatite. Experiments below 1 K and pressures above 10 GPa clearly show that the pressure dependence of the linear temperature coefficient of the specific heat can be measured. It is in qualitative agreement to a related quantity obtained quasi-simultaneously by electrical resistivity measurements on the same sample.

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