Journal
PHYSICAL REVIEW B
Volume 84, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.184420
Keywords
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Funding
- SNSF [200020-135085]
- National Center of Competence in Research (NCCR)
- Swiss National Science Foundation (SNF) [200020_135085] Funding Source: Swiss National Science Foundation (SNF)
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We performed far-infrared optical spectroscopy measurements on the heavy fermion compound URu2Si2 as a function of temperature. The light's electric field was applied along the a or c axis of the tetragonal structure. We show that in addition to a pronounced anisotropy, the optical conductivity exhibits for both axis a partial suppression of spectral weight around 12 meV and below 30 K. We attribute these observations to a change in the band structure below 30 K. However, since these changes have no noticeable impact on the entropy nor on the DC transport properties, we suggest that this is a crossover phenomenon rather than a thermodynamic phase transition.
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