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Cu-NMR Studies of the Heavy-Fermion Compound CeCu6 under High Magnetic Fields
Keisuke Kuroda,Kyohei Morita,Hisashi Kotegawa,Hitoshi Sugawara,Hideki Tou 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report a Cu NMR Knight shift K in a prototypical heavy-fermion system CeCu6 in thetemperature range of 1.5 K - 100 K at applied magnetic fields up to 15 T. With increasing magneticfield, the 63Cu NMR Knight shift for Hk[001] is suppressed drastically. The suppression of K withincreasing field is consistent with the field dependence of the susceptibility. In order to explainthis behavior, we adopted the Kondo resonance level model, where the thermodynamics at lowtemperatures are proportional to the density of states at the energy µH. The resonant model wasfound to correctly predict the suppression of the Knight shift with increasing magnetic field.