| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥2,900,000 (Direct Cost: ¥2,900,000)
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| Research Abstract |
In accordance with the plans,
(1) Single crystals, Ce(Ru_<1-x>Rh_x)_2Si_2 for x = 0.4, 0.5 and 0.6, were made.
(2) An ac susceptibility measurement system was made, which works in the temperature range down to 50 mK and in the magnetic field up to 6 T.
We found the ac susceptibilities under magnetic fields χ(T,H) can be expressed by the scaling law as the following.
χ(T,H) = T^γf(H/T^δ) (T<1K, H<0.1T)
The values of indexes γ, δ of x = 0.5 are different from those of x = 0.6. The scaling law suggests the origin of the non-Fermi liquid behavior in Ce(Ru_<1-x>Rh_x)_2Si_2 is the critical phenomena of the phase transition at T = 0 K. The spin at Ce atom in the mixed compound has good Ising character due to the doublet ground state and has a high Kondo temperature, and the disorder due to the Rh substitution is introduced. Quantum Griffiths phase at T = 0 K can be expected under such a situation. Our results strongly suggest the origin of the non-Fermi liquid behavior is the critical phenomena of the phase transition to quantum Griffiths phase at T = 0 K.
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