Abstract
The heavy fermion system CeNi9Ge4 exhibits a paramagnetic ground state with remarkable features such as: a record value of the electronic specific heat coefficient in systems with a paramagnetic ground state, γ C/T ≃ 5.5 J/molK2 at 80 mK, a temperature-dependent Sommerfeld-Wilson ratio, R = χ/γ, below 1 K and an approximate single ion scaling of the 4f-magnetic specific heat and susceptibility. These features are related to a rather small Kondo energy scale of a few Kelvin in combination with a quasi-quartet crystal field ground state. Tuning the system towards long range magnetic order is accomplished by replacing a few at.% of Ni by Cu or Co. Specific heat, susceptibility and resistivity studies reveal TN ∼ 0.2 K for CeNi8CuGe4 and TN ∼ 1K for CeNi8CoGe4. To gain insight whether the transition from the paramagnetic NFL state to the magnetically ordered ground state is connected with a heavy fermion quantum critical point we performed specific heat and ac susceptibility studies and utilized the μSR technique and quasi-elastic neutron scattering.
Original language | English |
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Article number | 012001 |
Journal | Journal of Physics: Conference Series |
Volume | 344 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2012 |
Externally published | Yes |
Event | International and Interdisciplinary Workshop on Novel Phenomena in Integrated Complex Sciences: From Non-Living to Living Systems, IIW-NPICS 2010 - Kyoto, Japan Duration: 11 Oct 2010 → 14 Oct 2010 |
ASJC Scopus subject areas
- General Physics and Astronomy