Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-10-25
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 4 figures
Scientific paper
The nature of the second order phase transition that occurs in URu2Si2 at 17.5 K remains puzzling despite intensive research over the past two and half decades. A key question emerging in the field is whether a hybridization gap between the renormalized bands can be identified as the long-sought 'hidden' order parameter. We report on the measurement of a hybridization gap in URu2Si2 employing a spectroscopic technique based on quasiparticle scattering across a ballistic metallic junction. The differential conductance exhibits an asymmetric double-peak structure, which we interpret as a signature for a Fano resonance in a Kondo lattice. The extracted hybridization gap opens well above the hidden order transition temperature, indicating that it is not the order parameter for the hidden order phase. Our results put constraints on the origin of the hidden order transition in URu2Si2 and demonstrate that quasiparticle scattering spectroscopy can measure the band renormalizations in a Kondo lattice by detecting a novel Fano resonance in this strongly correlated electron system.
Bauer Eric D.
Greene Laura H.
Park Kyoung Wan
Ronning Filip
Sarrao John L.
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