Transport properties of heavy-fermion systems

Grenzebach, Claas; Anders, Frithjof B.; Czycholl, Gerd; Pruschke, Thomas

doi:10.1103/physrevb.74.195119

Cited by 81 publications

(82 citation statements)

References 86 publications

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“…Detailed numerical studies using dynamical mean-field theory 30,31 and its cluster generalizations 32 have verified that the effective two-band picture emerging from the slave-boson approximation qualitatively captures the low-energy physics of the heavy Fermi-liquid phase of the PAM.…”

Section: 29mentioning

confidence: 99%

Doping-induced band shifts and Lifshitz transitions in heavy-fermion metals

Benlagra

Vojta

2013

Phys. Rev. B

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For some heavy-fermion compounds, it has been suggested that a Fermi-surface-changing Lifshitz transition, which can be driven, e.g., by varying an applied magnetic field, occurs inside the heavyfermion regime. Here we discuss, based on microscopic calculations, how the location of such a transition can be influenced by carrier doping. Due to strong correlations, a heavy band does not shift rigidly with the chemical potential. Intriguingly, we find that the actual shift is determined by the interplay of heavy and additional light bands crossing the Fermi level: doped carriers tend to populate heavy and light bands equally, despite the fact that the latter contribute a small density of states of excitations only. This invalidates naive estimates of the transition shift based on the low-temperature specific heat of the heavy Fermi liquid. We discuss applications of our results.

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Section: 29mentioning

confidence: 99%

Doping-induced band shifts and Lifshitz transitions in heavy-fermion metals

Benlagra

Vojta

2013

Phys. Rev. B

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“…The Seebeck coefficient, like the electrical and thermal conductivities, is exactly computable within DMFT [41] using the fully renormalized DMFT propagators. Here, we determine the transport coefficients using the generalized Kubo formulation to the three-band case relevant for bulk BP [42].…”

Section: B Electrical and Thermal Transport Properties Of Pure And Dmentioning

confidence: 99%

Electronic structure and thermoelectric transport of black phosphorus

2017

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We investigate anisotropic electronic structure and thermal transport properties of bulk black phosphorus (BP). Using density functional dynamical mean-field theory we first derive a correlation-induced electronic reconstruction, showing band-selective Kondoesque physics in this elemental p-band material. The resulting correlated picture is expected to shed light onto the temperature and doping dependent evolution of resistivity, Seebeck coefficient, and thermal conductivity, as seen in experiments on bulk single crystal BP. Therein, large anisotropic particle-hole excitations are key to consistently understand thermoelectric transport responses of pure and doped BP.

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“…Various theoretical approaches, including several numerical studies, reproduce the generic composite band structure shown in Fig. 1d [20][21][22][23][24] . Recent theoretical modelling has also shown that tunnelling spectroscopy can be a powerful probe of this composite nature of heavy fermions [25][26][27][28] .…”

Section: Composite Heavy-fermion Excitationsmentioning

confidence: 99%

Visualizing heavy fermions emerging in a quantum critical Kondo lattice

Aynajian

Neto

Gyenis

et al. 2012

Nature

206

211

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In solids containing elements with f orbitals, the interaction between f-electron spins and those of itinerant electrons leads to the development of low-energy fermionic excitations with a heavy effective mass. These excitations are fundamental to the appearance of unconventional superconductivity and non-Fermi-liquid behaviour observed in actinide- and lanthanide-based compounds. Here we use spectroscopic mapping with the scanning tunnelling microscope to detect the emergence of heavy excitations with lowering of temperature in a prototypical family of cerium-based heavy-fermion compounds. We demonstrate the sensitivity of the tunnelling process to the composite nature of these heavy quasiparticles, which arises from quantum entanglement of itinerant conduction and f electrons. Scattering and interference of the composite quasiparticles is used to resolve their energy-momentum structure and to extract their mass enhancement, which develops with decreasing temperature. The lifetime of the emergent heavy quasiparticles reveals signatures of enhanced scattering and their spectral lineshape shows evidence of energy-temperature scaling. These findings demonstrate that proximity to a quantum critical point results in critical damping of the emergent heavy excitation of our Kondo lattice system.Comment: preprint version, 26 pages, 6 figures. Supplementary: 15 pages, 14 figure

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Transport properties of heavy-fermion systems

Cited by 81 publications

References 86 publications

Doping-induced band shifts and Lifshitz transitions in heavy-fermion metals

Doping-induced band shifts and Lifshitz transitions in heavy-fermion metals

Electronic structure and thermoelectric transport of black phosphorus

Visualizing heavy fermions emerging in a quantum critical Kondo lattice

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