Evolution of Quantum Criticality in CeNi_{9-x}Cu_xGe_4

Simple item page
dc.creatorPeyker, L.
dc.creatorGold, C.
dc.creatorScheidt, E. -W.
dc.creatorScherer, W.
dc.creatorDonath, J. G.
dc.creatorGegenwart, P.
dc.creatorMayr, F.
dc.creatorEyert, V.
dc.creatorBauer, E.
dc.creatorMichor, H.
dc.date2008-12-17
dc.date.accessioned2026-07-07T13:15:26Z
dc.date.available2026-07-07T13:15:26Z
dc.descriptionCrystal structure, specific heat, thermal expansion, magnetic susceptibility and electrical resistivity studies of the heavy fermion system CeNi_{9-x}Cu_xGe_4 (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 CeNi_9Ge_4 (with pronounced non-Fermi-liquid features) towards a magnetically ordered, effectively twofold degenerate ground state in CeNi_8CuGe_4 with T_N = 175 +- 5 mK. Quantum critical behavior, C/T ~ χ~ -ln(T), is observed for x about 0.4. Hitherto, CeNi_{9-x}Cu_xGe_4 represents the first system where a substitution-driven quantum phase transition is connected not only with changes of the relative strength of Kondo effect and RKKY interaction, but also with a reduction of the effective crystal field ground state degeneracy.
dc.description15 pages, 9 figures
dc.identifierhttps://arxiv.org/abs/0812.3309
dc.identifierhttp://arxiv.org/abs/0812.3309
dc.identifierJ. Phys.: Condens. Matter 21 (2009) 235604
dc.identifierdoi:10.1088/0953-8984/21/23/235604
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230469
dc.subjectStrongly Correlated Electrons
dc.titleEvolution of Quantum Criticality in CeNi_{9-x}Cu_xGe_4
dc.typetext

Files

Collections

arXiv