Dramatic change of optical properties at a quantum critical point in the heavy fermion system |
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Authors: | Y.Y. Song K.E. Lee J.B. Hong H.J. Im S. Kimura Y.S. Kwon |
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Affiliation: | aDepartment of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea;bUVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan |
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Abstract: | Optical properties of have been studied via infrared spectroscopy. For x>0.3, a hump in the optical conductivity σ1 is observed at about 0.2 eV, resulting from strong hybridization between conduction electrons and Ce 4-f electronic states. For x0.3, in contrast, no such hump is observed. The low frequency plasmon indicating the existence of heavy particles is also observed below coherence temperature T* for x>0.3. |
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Keywords: | mml15" > text-decoration:none color:black" href=" /science?_ob=MathURL&_method=retrieve&_udi=B6TJ9-4RDPYT2-9&_mathId=mml15&_user=10&_cdi=5305&_rdoc=38&_acct=C000054348&_version=1&_userid=3837164&md5=3411a02e1e13ec8b7c3ac02671e2b8d1" title=" Click to view the MathML source" alt=" Click to view the MathML source" >CeNi1-xCoxGe2 Quantum criticality Optical conductivity Hybridization gap |
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