EFFECTS OF PRESSURE ON THE SUPERCONDUCTING TRANSITION TEMPERATURES OF SN, INDIUM, TA, TL, AND HG
EFFECTS OF PRESSURE ON THE SUPERCONDUCTING TRANSITION TEMPERATURES OF SN, INDIUM, TA, TL, AND HG
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DOI：
10.1103/physrev.112.31
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发表时间：
1958-01-01
期刊：
影响因子：
--
通讯作者：
SWENSON, CA
中科院分区：
文献类型：
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作者：
JENNINGS, LD;SWENSON, CA
固体对氢已被用作近似静水压力的变送器，用于研究高达10,000大气压的压力对多晶锡、铟、钽、铊和汞的超导转变温度的影响。所使用的技术允许对样品变形和压力梯度的影响进行近似评估，结果比以前可用的高压数据准确得多。锡和铟的转变温度数据在与压力的关系中显示出相当大的曲率，但在与体积的关系中则大致呈线性关系。没有发现钽的曲率。铊的数据与以前的工作在质量上一致，并且在大约2000大气压时显示了转变温度与压力曲线的最大值。汞的结果是异常的，发现了两条不同的转变温度-压力曲线（不同的零压转变温度）；一种是压力保持在4000大气压以下，另一种是样品从0到10000大气压循环。其他实验表明，这些结果是由于固体汞的两种不同的修饰，每一种都可以存在于液氦温度下。
Solid parahydrogen has been used as a transmitter of approximately hydrostatic pressure to study the effects of pressures up to 10 000 atmos on the superconducting transition temperatures of polycrystalline tin, indium, tantalum, thallium, and mercury. The technique which was used allowed an approximate evaluation of the effects of sample deformation and pressure gradients, and the results are considerably more accurate than the high-pressure data previously available. The transition temperature data for tin and indium showed considerable curvature when plotted vs pressure, but gave a roughly linear relationship when plotted against volume. No curvature was found for tantalum. The thallium data agree qualitatively with previous work, and show a maximum in the transition temperature vs pressure curve at about 2000 atmos. The mercury results were anomalous in that two distinct transition temperature vs pressure curves (with different zero-pressure transition temperatures) were found; one when the pressure was kept below 4000 atmos, and the other when the sample was cycled from zero to 10 000 atmos. Other experiments have shown that these results are due to two different modifications of solid mercury, each of which can exist at liquid helium temperatures.