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Role of the tuning parameter at magnetic quantum phase transitions

MPG-Autoren
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Stockert,  O.
Oliver Stockert, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Woitschach,  S.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Huesges,  Z.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Lucas,  Stefan
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Fritsch, V., Stockert, O., Huang, C.-.-L., Bagrets, N., Kittler, W., Taubenheim, C., et al. (2015). Role of the tuning parameter at magnetic quantum phase transitions. European Physical Journal - Special Topics, 224(6), 997-1019. doi:10.1140/epjst/e2015-02443-6.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0028-4FBC-E
Zusammenfassung
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-x Au (x) and CePd1-x Ni (x) Al. 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 kagom, 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-x V (x) Ge-3 where CeTiGe3 is a ferromagnet, thus allowing the study of ferromagnetic quantum criticality, a rare case for heavy-fermion systems.