Further pressure studies around the magnetic instability of CePd2Si2
Further pressure studies around the magnetic instability of CePd2Si2
复制标题
关于 CePd2Si2 磁不稳定性的进一步压力研究
DOI：
10.1088/0953-8984/13/41/320
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Flouquet
中科院分区：
文献类型：
--
作者：
A. Demuer;D. Jaccard;I. Sheikin;S. Raymond;B. Salce;J. Thomasson;D. Braithwaite;J. Flouquet
在金刚石顶压室中使用氦作为传压介质，使反铁磁体CePd2Si2的高质量样品能够在高度静水压的环境中进行研究。在低温力调制装置的帮助下，交流量热测量高达25kbar，PC两侧的电阻率测量高达33kbar，范围在28-29.5kbar之间。在Pc周围发现的狭窄的超导磁区表明了磁不稳定性与库珀对的形成之间的联系。我们认为，剩余电阻率对超导电性的出现和相应的跃迁宽度都有影响。在接近Pc的情况下，正常态的电阻率与温度的关系定性地符合自旋涨落模型。虽然标准的费米液体行为在PC附近被发现分解，但它在33Kbar时重新出现在700MK以下，而在上面不到5Kbar。
Using helium as a pressure-transmitting medium in a diamond anvil cell enabled a high-quality sample of the antiferromagnet CePd2Si2 to be studied in a highly hydrostatic environment. With the aid of a low-temperature force-modulation device, ac calorimetric measurements were made up to 25 kbar and resistivity measurements up to 33 kbar, on both sides of PC, found between 28 and 29.5 kbar. The narrow superconducting domain found around PC indicates the connection between the magnetic instability and the formation of Cooper pairs. We assert that there is an influence of the residual resistivity both on the emergence of superconductivity, and on the corresponding transition width. Close to PC, the temperature dependence of the resistivity in the normal state qualitatively agrees with the spin-fluctuation model. While standard Fermi liquid behaviour was found to break down in the immediate vicinity of PC, it reappeared below 700 mK at 33 kbar, less than 5 kbar above.