Visualizing the formation of the Kondo lattice and the hidden order in URu2Si2

被引:168
作者
Aynajian, Pegor [1 ,2 ]
da Silva Neto, Eduardo H. [1 ,2 ]
Parker, Colin V. [1 ,2 ]
Huang, Yingkai [3 ]
Pasupathy, Abhay [4 ]
Mydosh, John [5 ]
Yazdani, Ali [1 ,2 ]
机构
[1] Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[3] Univ Amsterdam, van der Waals Zeeman Inst, NL-1018 XE Amsterdam, Netherlands
[4] Columbia Univ, Dept Phys, New York, NY 10027 USA
[5] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands
基金
美国国家科学基金会;
关键词
heavy fermion; scanning tunneling spectroscopy; POINT-CONTACT SPECTROSCOPY; FERMI-SURFACE; MAGNETIC EXCITATIONS; HEAVY; SUPERCONDUCTIVITY; INSTABILITY; RESONANCE; SYSTEM;
D O I
10.1073/pnas.1005892107
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Heavy electronic states originating from the f atomic orbitals underlie a rich variety of quantum phases of matter. We use atomic scale imaging and spectroscopy with the scanning tunneling microscope to examine the novel electronic states that emerge from the uranium f states in URu2Si2. We find that, as the temperature is lowered, partial screening of the f electrons' spins gives rise to a spatially modulated Kondo-Fano resonance that is maximal between the surface U atoms. At T = 17.5 K, URu2Si2 is known to undergo a second-order phase transition from the Kondo lattice state into a phase with a hidden order parameter. From tunneling spectroscopy, we identify a spatially modulated, bias-asymmetric energy gap with a mean-field temperature dependence that develops in the hidden order state. Spectroscopic imaging further reveals a spatial correlation between the hidden order gap and the Kondo resonance, suggesting that the two phenomena involve the same electronic states.
引用
收藏
页码:10383 / 10388
页数:6
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