Hybridization gap and anisotropic far-infrared optical conductivity of URu2Si2

Abstract

We performed far-infrared optical spectroscopy measurements on the heavy fermion compound URu 2 Si 2 as a function of temperature. The light's electric-field was applied along the a-axis or the 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 bandstructure 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.

To be published in Physical Review B

References in corpus (9)

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Cited by in corpus (23)

• Hidden Order Behaviour in URu2Si2 (A Critical Review of the Status of Hidden Order in 2014)
• Observation of the hybridization gap and Fano resonance in the Kondo lattice URu2Si2
• Optical spectroscopy shows that the normal state of URu${}_2$Si${}_2$ is an anomalous Fermi liquid
• Momentum-resolved evolution of the Kondo lattice into 'hidden-order' in URu2Si2
• Anisotropic optical conductivity of the putative Kondo insulator CeRu${}_4$Sn${}_6$
• Symmetry and correlations underlying Hidden Order in URu2Si2
• Interplay of magnetism, Fermi surface reconstructions, and hidden-order in the heavy-fermion material URu${}_2$Si${}_2$
• Analogy between the "Hidden Order" and the Orbital Antiferromagnetism in URu${}_{2-x}$Fe${}_x$Si${}_2$
• Hidden order pseudogap in URu${}_2$Si${}_2$
• Lattice dynamics of the heavy fermion compound URu${}_2$Si${}_2$
• High-magnetic field lattice length changes in URu2Si2
• Observation of Multiple-Gap Structure in Hidden Order State of URu2Si2 from Optical Conductivity
• Hybridization gap versus hidden order gap in URu${}_2$Si${}_2$ as revealed by optical spectroscopy
• Nuclear magnetic resonance studies of pseudospin fluctuations in URu${}_2$Si${}_2$
• Optical conductivity of URu${}_2$Si${}_2$ in the Kondo Liquid and Hidden-Order Phases
• Detailed optical spectroscopy of the hybridization gap and the hidden order transition in high quality URu${}_2$Si${}_2$ single crystals
• Modulated Spin Liquid and Magnetic Order from a Kondo-Heisenberg model applied to $UR{u}_{2}S{i}_2$
• Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
• Global perspectives of the bulk electronic structure of URu${}_2$Si${}_2$ from angle-resolved photoemission
• Optical study of hybridization and hidden order in URu${}_2$Si${}_2$
• Anisotropic Kondo pseudo-gap in URu2Si2
• 29Si nuclear magnetic resonance study of URu2Si2 under pressure
• Quasiparticle Relaxation Dynamics in URu${}_{2-x}$Fe${}_x$Si${}_2$ Single Crystals