A drastic change of the fermi surface at a critical pressure in CeRhIn5:: dHvA study under pressure
A drastic change of the fermi surface at a critical pressure in CeRhIn5:: dHvA study under pressure
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DOI：
10.1143/jpsj.74.1103
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发表时间：
2005-04-01
影响因子：
1.7
通讯作者：
Onuki, Y
中科院分区：
文献类型：
--
作者：
Shishido, H;Settai, R;Onuki, Y
我们在高达3 GPa的高压下对反铁磁物质CeRhIn 5进行了de Haas-van Alphen（dHvA）实验。常压下dHvA主支α（i）和β（2）的费米面截面积在2.3GPa下没有变化，这可以用非4f参比化合物LaRhIn 5的两种近圆柱费米面很好地解释，而相应的回旋质量m（c）* 在压力P* = 1.6GPa以上急剧增加，其中压力诱导超导性集为：例如，对于分支2，在环境压力下m（c）* = 5.5 m（0），在6 GPa下为20 m（0），在2.2 GPa下为60 m（0）。在2.4GPa以上，出现了新的dHvA分支，与4f-巡游重费米子超导体CeCoIn 5的dHvA分支一致，表明CeRhIn 5的4f电子变得巡游，并对费米面的体积有显著贡献.因此，4f-电子的字符从本地化的巡回在临界压力P-c类似或等于2.35 GPa，超导转变温度成为最大值。
We carried out the de Haas-van Alphen (dHvA) experiment for an antiferromagnet CeRhIn5 at high pressures up to 3 GPa. The cross-sectional areas of the Fermi surfaces due to main dHvA branches alpha(i) and beta(2) at ambient pressure, which are well explained by two kinds of nearly cylindrical Fermi surfaces of a non-4f reference compound LaRhIn5, are unchanged up to about 2.3 GPa, while the corresponding cyclotron masses m(c)* increase steeply above a pressure P* = 1.6GPa where pressure-induced superconductivity Sets in : m(c)* = 5.5 m(0) at ambient pressure, 20 m(0) at 6 GPa and 60 m(0) at 2.2 GPa for branch 2, for example. Above 2.4 GPa, new dHvA branches appear, which are in good agreement with the corresponding dHvA branches of a 4f-itinerant heavy fermion superconductor CeCoIn5, indicating that the 4f electron of CeRhIn5 becomes itinerant and significantly contributes to the volume of the Fermi surface. The 4f-electron character is thus changed from localized to itinerant at a critical pressure P-c similar or equal to 2.35 GPa, where the superconducting transition temperature becomes a maximum.