Temperature- and Magnetic-Field-Dependent Optical Properties of Heavy Quasiparticles in YbIr2Si2
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概要
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We report the temperature- and magnetic-field-dependent optical conductivity spectra of the heavy electron metal YbIr2Si2. Upon cooling below the Kondo temperature ($T_{\text{K}}$), we observed a typical charge dynamics that is expected for a formation of a coherent heavy quasiparticle state. We obtained a good fitting of the Drude weight of the heavy quasiparticles by applying a modified Drude formula with a photon energy dependence of the quasiparticle scattering rate that shows a similar power-law behavior as the temperature dependence of the electrical resistivity. By applying a magnetic field of 6 T below $T_{\text{K}}$, we found a weakening of the effective dynamical mass enhancement by about 12% in agreement with the expected decrease of the 4f-conduction electron hybridization on magnetic field.
- 2010-12-15
著者
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Geibel Christoph
Max Planck Institute For Chemical Physics Of Solids
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Steglich Frank
Max Planck Institute For Chemical Physics Of Solids
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KIMURA Shin-ichi
School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI)
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Iizuka Takuya
School Of Physical Sciences The Graduate University For Advanced Studies (sokendai)
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Herzog Alexander
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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Sichelschmidt Jörg
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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Krellner Cornelius
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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Iizuka Takuya
School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Okazaki, Aichi 444-8585, Japan
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Krellner Cornelius
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany
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