Pressure-Driven Quantum Criticality in Iron-Selenide Superconductors
Pressure-Driven Quantum Criticality in Iron-Selenide Superconductors
复制标题
硒化铁超导体中压力驱动的量子临界
DOI：
10.1103/physrevlett.108.197001
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发表时间：
2012-05-08
影响因子：
8.6
通讯作者：
Zhao, Zhongxian
中科院分区：
文献类型：
--
作者：
Guo, Jing;Chen, Xiao-Jia;Zhao, Zhongxian
我们通过金刚石砧室中的原位高压电传输和 X 射线衍射测量，报告了 K0.8Fe(x)Se2（x = 1.7 和 1.78）超导体中压力诱导的量子临界转变的发现。在9.2-10.3 GPa的压力范围内发现了从金属费米液体行为到非费米液体行为以及从反铁磁性到顺磁性的转变，其中超导性趋于消失。铁硒化物超导体中量子临界点周围从共存的反铁磁性态和费米液体行为到顺磁性状态和非费米液体行为的变化表明了其量子临界转变的独特机制。
We report a finding of a pressure-induced quantum critical transition in K0.8Fe(x)Se2 (x = 1.7 and 1.78) superconductors through in situ high-pressure electrical transport and x-ray diffraction measurements in diamond anvil cells. Transitions from metallic Fermi liquid behavior to non-Fermi liquid behavior and from antiferromagnetism to paramagnetism are found in the pressure range of 9.2-10.3 GPa, in which superconductivity tends to disappear. The change around the quantum critical point from the coexisting antiferromagnetism state and the Fermi liquid behavior to the paramagnetism state and the non-Fermi liquid behavior in the iron-selenide superconductors demonstrates a unique mechanism for their quantum critical transition.