TY - JOUR
T1 - Role of the tuning parameter at magnetic quantum phase transitions
AU - Fritsch, V.
AU - Stockert, O.
AU - Huang, C. L.
AU - Bagrets, N.
AU - Kittler, W.
AU - Taubenheim, C.
AU - Pilawa, B.
AU - Woitschach, S.
AU - Huesges, Z.
AU - Lucas, S.
AU - Schneidewind, A.
AU - Grube, K.
AU - Löhneysen, H. V.
N1 - Publisher Copyright:
© EDP Sciences, Springer-Verlag 2015.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Heavy-fermion systems, with their competition between Kondo and RKKY interactions, offer a rich variety of materials that may be driven to a magnetic quantum phase transition. Quite often, a quantum critical point can be approached by chemical substitution, notably of isoelectric ligands of Ce, as in CeCu6−xAux and CePd1−xNixAl. While in the former we compare pressure and concentration tuning of the magnetic structure, the latter has the additional feature of geometric frustration due to the distorted kagomè sublattice of Ce atoms in the basal plane. We further present the system CeAu2Ge2 where minor structural differences between crystals grown from Sn or Au-Ge flux lead to pronounced differences in the magnetic structure, with several field-induced phases in samples grown from Au-Ge flux. Finally, non-isoelectronic substitution of Ti by V is studied in CeTi1−xVxGe3 where CeTiGe3 is a ferromagnet, thus allowing the study of ferromagnetic quantum criticality, a rare case for heavyfermion systems.
AB - Heavy-fermion systems, with their competition between Kondo and RKKY interactions, offer a rich variety of materials that may be driven to a magnetic quantum phase transition. Quite often, a quantum critical point can be approached by chemical substitution, notably of isoelectric ligands of Ce, as in CeCu6−xAux and CePd1−xNixAl. While in the former we compare pressure and concentration tuning of the magnetic structure, the latter has the additional feature of geometric frustration due to the distorted kagomè sublattice of Ce atoms in the basal plane. We further present the system CeAu2Ge2 where minor structural differences between crystals grown from Sn or Au-Ge flux lead to pronounced differences in the magnetic structure, with several field-induced phases in samples grown from Au-Ge flux. Finally, non-isoelectronic substitution of Ti by V is studied in CeTi1−xVxGe3 where CeTiGe3 is a ferromagnet, thus allowing the study of ferromagnetic quantum criticality, a rare case for heavyfermion systems.
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U2 - 10.1140/epjst/e2015-02443-6
DO - 10.1140/epjst/e2015-02443-6
M3 - Review article
AN - SCOPUS:84943236492
SN - 1951-6355
VL - 224
SP - 997
EP - 1019
JO - European Physical Journal: Special Topics
JF - European Physical Journal: Special Topics
IS - 6
M1 - A003
ER -