Oike H, Miyagawa K, Taniguchi H, Kanoda K
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
Department of Physics, Saitama University, Saitama, Saitama 338-8570, Japan.
Phys Rev Lett. 2015 Feb 13;114(6):067002. doi: 10.1103/PhysRevLett.114.067002. Epub 2015 Feb 9.
We report the pressure study of a doped organic superconductor with a Hall coefficient and conductivity measurements. We find that maximally enhanced superconductivity and a marginal-Fermi liquid appear around a certain pressure where mobile carriers increase critically, suggesting a possible quantum phase transition between strongly and weakly correlated regimes. This observation points to the presence of a criticality in Mottness for a doped Mott insulator with tunable correlation.
我们通过霍尔系数和电导率测量报告了一种掺杂有机超导体的压力研究。我们发现，在某个压力附近，当可移动载流子急剧增加时，超导性得到最大增强且出现了边缘费米液体，这表明在强关联和弱关联 regime 之间可能存在量子相变。这一观察结果表明，对于具有可调关联的掺杂莫特绝缘体，在莫特性中存在临界性。
