Hybridization gap and anisotropic far-infrared optical conductivity of URu2Si2

Article

关键词: ELECTRON SUPERCONDUCTOR URU2SI2;    POINT-CONTACT SPECTROSCOPY;    HIDDEN-ORDER TRANSITION;    FERMI-SURFACE;    EXCITATIONS;    INSTABILITY;    LATTICE;    FIELD;   

DOI  :  10.1103/PhysRevB.84.184420

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free