压力对$_{3}$ Pd $_{20}$-Si $_{6}$四极和磁转变的逆效应
Converse effect of pressure on quadrupolar and magnetic transition in Ce$_{3}$Pd$_{20}$Si$_{6}$
摘要：
重费米子化合物Ce $_{3}$ Pd $_{20}$ Si $_{6}$显示出非常规的量子临界性，因为磁场完全抑制了两个连续相变中较低的一个。在这里，我们报告的影响，压力作为额外的调谐参数。比热和电阻率测量揭示了压力对两个转变的相反影响，导致在6.2 kbar的两个转变的合并。场诱导量子临界在压力调谐下是稳健的。我们合理化我们的发现在反铁磁重费米子量子临界的全球相图的扩展版本。
英文摘要：
The heavy fermion compound Ce$_{3}$Pd$_{20}$Si$_{6}$ displays unconventional quantum criticality as the lower of two consecutive phase transitions is fully suppressed by magnetic field. Here we report on the effects of pressure as additional tuning parameter. Specific heat and electrical resistivity measurements reveal a converse effect of pressure on the two transitions, leading to the merging of both transitions at 6.2 kbar. The field-induced quantum criticality is robust under pressure tuning. We rationalize our findings within an extended version of the global phase diagram for antiferromagnetic heavy fermion quantum criticality.
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