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Optical spectra of the heavy fermion uniaxial ferromagnet UGe2

Optical spectra of the heavy fermion uniaxial ferromagnet UGe2,10.1103/PhysRevB.78.172406,Physical Review B,Violeta Guritanu,Peter Armitage,Riccardo T

Optical spectra of the heavy fermion uniaxial ferromagnet UGe2  
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We report a detailed study of UGe2 single crystals using infrared reflectivity and spectroscopic ellipsometry. The optical conductivity suggests the presence of a low-frequency interband transition and a narrow free-carrier response with strong frequency dependence of the scattering rate and effective mass. We observe sharp increase in the low-frequency mass and reduction in scattering rate below the upper ferromagnetic transition TC=53K indicating the emergence of a heavy fermion state triggered by the ferromagnetic order. The characteristic changes are exhibited most strongly at an energy scale below 12 meV. They recover their unrenormalized value above TC and for omega>40meV . In contrast no sign of an anomaly is seen at the lower transition temperature of unknown nature, Tx˜30K , observed in transport and thermodynamic experiments.
Journal: Physical Review B - PHYS REV B , vol. 78, no. 17, 2008
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