Visualizing the formation of the Kondo lattice and the hidden order in URu(2)Si(2).
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 URu(2)Si(2). 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, URu(2)Si(2) 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.
Aynajian
Pegor
P
Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, NJ 08544, USA.
da Silva Neto
Eduardo H
EH
Parker
Colin V
CV
Huang
Yingkai
Y
Pasupathy
Abhay
A
Mydosh
John
J
Yazdani
Ali
A