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View or edit your browsing history. Get to Know Us. English Choose a language for shopping. Amazon Music Stream millions of songs. Heavy fermion materials play an important role in current scientific research, acting as prototypical materials for unconventional superconductivity, non fermi liquid behavior and quantum criticality. The actual interaction between localized magnetic moments and conduction electrons in heavy fermion compounds is still not completely understood and a topic of ongoing investigation.
Heavy fermion materials belong to the group of strongly correlated electron systems. Several members of the group of heavy fermion materials become superconducting below a critical temperature. The superconductivity is unconventional. At high temperatures, heavy fermion compounds behave like normal metals and the electrons can be described as a Fermi gas , in which the electrons are assumed to be non-interacting fermions.
The Fermi liquid theory by Landau provides a good model to describe the properties of most heavy fermion materials at low temperatures. In this theory, the electrons are described by quasiparticles, which have the same quantum numbers and charge, but the interaction of the electrons is taken into account by introducing an effective mass , which differs from the actual mass of a free electron. In order to obtain the optical properties of heavy fermion systems, these materials have been investigated by optical spectroscopy measurements.
Heavy-Fermion Systems - 1st Edition - ISBN: , Page Count: View all volumes in this series: Handbook of Metal Physics. Read the latest chapters of Handbook of Metal Physics at domaine-solitude.com, Elsevier's leading platform of peer-reviewed scholarly literature.
Measuring the reflected or transmitted light reveals the characteristic energies of the sample. Due to the high scattering rate, the conductivity for dc and at low frequencies is rather low. A conductivity roll-off Drude roll-off occurs at the frequency that corresponds to the relaxation rate. This leads to the enhanced effective mass, and a hybridization gap develops.
In contrast to Kondo insulators , the chemical potential of heavy fermion compounds lies within the conduction band. These changes lead to two important features in the optical response of heavy fermions. Since the conductivity does not vanish completely, the observed gap is actually a pseudogap.
In the temperature range mentioned above, the electronic contribution is the major part of the specific heat. For the free-electron gas — a simple model system that neglects electron interaction — or metals that could be described by it, the electronic specific heat is given by. Experimental results for the specific heat of the heavy fermion compound UBe 13 show a peak at a temperature around 0.
In contrast, above 6 K, the specific heat for this heavy fermion compound approaches the value expected from free-electron theory.