The thermopower as a signature of quantum criticality in heavy fermions

Abstract

We present a series of arguments showing that the Seebeck coefficient can be used as a decisive experiment to characterize the nature of the quantum critical point (QCP) in heavy fermion compounds. Being reactive almost exclusively to the presence of delocalized entropic carriers, the Seebeck coefficient shows a drastic collapse at the Kondo breakdown QCP, as the reconstruction of the Fermi surface takes place. In contrast, around a Spin Density Wave (SDW) QCP, the Seebeck coefficient is broadly symmetric. We discuss the possibility of a change of sign at the QCP, the characteristic variation of $|S/T|$ with temperature and external parameter, as well as the capacity of the Seebeck coefficient to distinguish between localized and itinerant anti-ferromagnetism (AF). Suggestions of experiments are given in the case of four non conventional compounds : YbRh${}_2$Si${}_2$, Ce(Mn)In${}_5$, CeCu${}_{6-x}$Au${}_x$ and URu${}_2$Si${}_2$.

References in corpus (24)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Fractionalized Fermi liquids
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• Arrested Kondo effect and hidden order in URu_2Si_2
• Quantum critical behavior in itinerant electron systems -- Eliashberg theory and instability of a ferromagnetic quantum-critical point
• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
• Fermi surface instability at the hidden-order transition of URu2Si2
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• Universal Behavior in Heavy Electron Materials
• Interplay between SDW and induced local moments in URu2Si2
• From itinerant to local-moment antiferromagnetism in Kondo lattices: Adiabatic continuity vs. quantum phase transitions
• Thermoelectric response near a quantum critical point: the case of CeCoIn5
• Selective Mott transition and heavy fermions
• Multi-scale fluctuations near a Kondo Breakdown Quantum Critical Point
• Cellular Dynamical Mean Field Theory of the Periodic Anderson Model
• Kondo volume collapse, Kondo breakdown, and Fermi surface transitions in heavy-fermion metals
• Anisotropic inelastic scattering and its interplay with superconductivity in URu${}_2$Si${}_2$
• Exact bosonization for an interacting Fermi gas in arbitrary dimensions
• Grüneisen ratio at the Kondo breakdown quantum critical point
• Enhancement of thermal transport in the degenerate periodic Anderson model
• Signature of Kondo breakdown quantum criticality in optical conductivity

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• Signatures of quantum criticality in the thermopower of Ba(Fe(1-x)Co(x))2As2
• Adaptation of the Landau-Migdal Quasiparticle Pattern to Strongly Correlated Fermi Systems
• Organic Superconductors: when correlations and magnetism walk in
• Anomalous Magnetothermopower in a Metallic Frustrated Antiferromagnet
• Thermoelectric response near a quantum critical point of beta-YbAlB4 and YbRh2Si2: A comparative study
• Quantum criticality in Ce2PdIn8: thermoelectric study
• Large Tunable Thermophase in Superconductor -- Quantum Dot -- Superconductor Josephson Junctions
• The thermopower as a fingerprint of the Kondo breakdown quantum critical point
• The Seebeck coefficient in correlated low dimensional organic metals
• Thermoelectric signature of quantum critical phase in a doped spin liquid candidate
• Enhanced Seebeck coefficient through the magnetic fluctuations in Sr${}_2$Ru${}_{1-x}{M}_x$O${}_4$ ($M=$ Co, Mn)
• Topological crossovers near a quantum critical point
• Probing quantum criticality in ferromagnetic CeRh6Ge4
• Unconventional and conventional quantum criticalities in CeRh${}_{0.58}$Ir${}_{0.42}$In${}_5$
• Strongly correlated Fermi systems as a new state of matter
• Nambu-Eliashberg theory for multi-scale quantum criticality : Application to ferromagnetic quantum criticality in the surface of three dimensional topological insulators
• Critical particle-hole composites at twice the Fermi wave vector in U(1) spin liquid with a Fermi surface
• Preformed heavy-electrons at the Quantum Critical Point in heavy fermion compounds
• Role of vertex corrections in the $T$-linear resistivity at the Kondo breakdown quantum critical point
• Scaling behavior of the thermopower of the archetypical heavy-fermion metal $\mathrm{YbR}{\mathrm{h}}_2\mathrm{S}{\mathrm{i}}_2$
• Evidence of electron fractionalization in the Hall coefficient at Mott criticality
• Thermopower across Fermi-volume-changing quantum phase transitions without translational symmetry breaking
• A phenomenological description on an incoherent Fermi liquid near optimal doping in high T_{c} cuprates
• Seebeck coefficient in low-dimensional fluctuating charge-density-wave systems