Journal
PHYSICAL REVIEW B
Volume 84, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.161101
Keywords
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Funding
- Seaborg Institute at Los Alamos National Laboratory
- Department of Energy
- Department of Homeland Security
- G. T. Seaborg Institute for Transactinium Science
- DOE BES, Division of Material Sciences
- Los Alamos Laboratory
- DOE BES [DE-FG02-09ER46643]
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Ultrafast optical spectroscopy was utilized to investigate carrier dynamics in the heavy-fermion compound URu2Si2 from 5 to 300 K. The amplitude and decay time of the photoinduced reflectivity increase in the vicinity of the coherence temperature T* similar to 57 K, consistent with the presence of a hybridization gap. At 25 K, a crossover regime manifests as a new feature in the carrier dynamics saturating below the hidden-order transition temperature of 17.5 K. This is indicative of a psuedogap region (17.5 K < T < 25 K) separating the normal Kondo-lattice state from the hidden-order phase. Rothwarf-Taylor modeling of the data yields values of similar to 10 meV (5 meV) for the hybridization gap (hidden-order gap).
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