Spin-Glass Freezing above the Ordering Temperature for the Kondo Antiferromagnet CeNi_2Sn_2 : Magnetism
0
Citation
0
Reference
20
Related Paper
Keywords:
Magnetism
Cite
Cite
Citations (0)
Orthorhombic crystal system
Kondo insulator
Cite
Citations (10)
Lattice (music)
Kondo insulator
Specific heat
Cite
Citations (0)
Lattice (music)
Cite
Citations (0)
Kondo insulator
Crystal system
Lattice (music)
Crystal (programming language)
Cite
Citations (43)
The pseudo-ternary solid solution CeNi(9)Ge(4-x)Si(x) (0 ≤ x ≤ 4) has been investigated by means of x-ray diffraction, magnetic susceptibility, specific heat, electrical resistivity, thermopower and inelastic neutron scattering studies. The isoelectronic substitution of germanium by silicon atoms causes a dramatic change of the relative strength of competing Kondo, RKKY and crystal field (CF) energy scales. The strongest effect is the continuous elevation of the Kondo temperature T(K) from approximately 3.5 K for CeNi(9)Ge(4) to about 70 K for CeNi(9)Si(4). This increase of the Kondo temperature is attended by a change of the CF level scheme of the Ce ions. The interplay of the different energy scales results in an incipient reduction of the ground state degeneracy from an effectively fourfold degenerate non-magnetic Kondo ground state with unusual non-Fermi-liquid features of CeNi(9)Ge(4) to a lower one, followed by an increase towards a sixfold, fully degenerate ground state multiplet in CeNi(9)Si(4) (T(K) ∼ Δ(CF)).
Kondo insulator
Multiplet
Crystal field theory
Cite
Citations (9)
Kondo insulator
Lattice (music)
Crystal system
Cite
Citations (16)
Magnetism
Critical point (mathematics)
Cite
Citations (13)
Crystal structure, specific heat, thermal expansion, magnetic susceptibility and electrical resistivity studies of the heavy fermion system CeNi9−xCuxGe4 (0≤x≤1) reveal a continuous tuning of the ground state by Ni/Cu substitution from an effectively fourfold-degenerate non-magnetic Kondo ground state of CeNi9Ge4 (with pronounced non-Fermi-liquid features) towards a magnetically ordered, effectively twofold-degenerate ground state in CeNi8CuGe4 with TN = 175 ± 5 mK. Quantum critical behavior, , is observed for . Hitherto, CeNi9−xCuxGe4 represents the first system where a substitution-driven quantum phase transition is connected not only with changes of the relative strength of the Kondo effect and RKKY interaction, but also with a reduction of the effective crystal field ground state degeneracy.
Kondo insulator
Degeneracy (biology)
Cite
Citations (17)