Abstract:
: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.
journal_name
Proc Natl Acad Sci U S Aauthors
Aynajian P,da Silva Neto EH,Parker CV,Huang Y,Pasupathy A,Mydosh J,Yazdani Adoi
10.1073/pnas.1005892107subject
Has Abstractpub_date
2010-06-08 00:00:00pages
10383-8issue
23eissn
0027-8424issn
1091-6490pii
1005892107journal_volume
107pub_type
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