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Abstract:
Quantum criticality arises from continuous changes of matter at absolute
zero temperature. It can have vast reaching influence on wide regions of
phase space and is often connected to the occurrence of non-Fermi liquid
behavior and unconventional superconductivity. Various different types
of quantum criticality have been observed over the last years and
4f-electron based heavy-fermion metals have become prototype materials
in which quantum criticality is easily realized by application of
pressure or magnetic field, as well as suitable changes in chemical
composition. Using low-temperature thermodynamic, magnetic and transport
experiments on clean prototype materials we investigate novel types of
quantum criticality arising from ferromagnetic fluctuations and strong
geometrical frustration, as well as quantum criticality hidden by
unconventional superconductivity.
