Non fermi liquid behavior in strongly correlated f-electron materials

Maple, M. B.; Seaman, C. L.; Gajewski, D. A.; Dalichaouch, Y.; Barbetta, V. B.; Andrade, M. C. de; Mook, H. A.; Lukefahr, H. G.; Bernal, O. O.; MacLaughlin, D. E.

doi:10.1007/bf00754938

Cited by 204 publications

(159 citation statements)

References 23 publications

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“…The NFL characteristics included a linear T -dependence of ρ, a logarithmic in T divergence of C/T , and a non-Curie Weiss χ that varies as T 1/2 . Interestingly, these NFL signatures were later observed in many other d-and f -electron systems [1,2,4,5], including both chemically substituted and stoichiometric compounds. The low temperature-composition (T -x) phase diagram of the Y 1−x U x Pd 3 system is shown in Fig.…”

Section: Y 1−x U X Pdmentioning

confidence: 88%

“…The rapid decrease of the Kondo temperature T K with x, indicated in Fig. 2, has been attributed to a 'Fermi level tuning' phenomenon in which the U 4+ 5f binding energy ε f = E F − E f , where E F is the Fermi energy and E f is the energy of the U 4+ 5f state, increases by 1 eV as x increases from 0 to 1 [1,50]. The increase of ε f with x was discovered in photoemission studies of Y 1−x U x Pd 3 [51] and can be understood in terms of the increase of E F with x as tetravalent U is substituted for trivalent Y.…”

Section: Y 1−x U X Pdmentioning

confidence: 99%

“…In performing such an analysis, it is most meaningful that it be performed on cubic materials if they are in the form of polycrystals; if the compounds are not cubic, it is preferable to work with single crystal specimens, if possible, to avoid obtaining a polycrystalline average over the different grains with varying orientations with respect to the current direction in the specimen. One of the most striking types of NFL behavior, which is nearly universal, is found in the specific heat C(T ), which can generally be described by a logarithmic or weak power law divergence in temperature T with decreasing T of C(T )/T [1,2,6,7,35]. In some cases, this behavior crosses over into a more rapid divergence with decreasing T .…”

Section: Issues Concerning Characterization Of Nfl Behaviormentioning

confidence: 99%

“…A large number of strongly correlated d-and f -electron systems have been investigated during the past two decades in which the Fermi liquid paradigm appears to be violated [1][2][3][4][5]. These systems are based on certain intermetallic compounds containing transition metal, lanthanide, or actinide ions such as Mn, Fe, Ce, Pr, Sm, Eu, Yb and U with partially-filled d-or f -electron shells in which the localized d-or f -states are hybridized with conduction electron states.…”

Section: Introductionmentioning

confidence: 99%

“…The NFL behavior is characterized by logarithmic or weak power law divergences in the physical properties at low temperatures T and an effective Fermi temperature that appears in the dynamical susceptibility that is the temperature T itself (i.e., ω/T scaling). The NFL behavior was first established in chemically substituted f -electron compounds containing nonmagnetic substituents [1,6,7] and subsequently observed in stoichiometric f -electron compounds [8,9]. Since these NFL characteristics are found in both chemically substituted and stoichiometric compounds, the underlying physics does not seem to be primarily driven by atomic disorder.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Section: Y 1−x U X Pdmentioning

confidence: 88%

Section: Y 1−x U X Pdmentioning

confidence: 99%

Section: Issues Concerning Characterization Of Nfl Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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NMR/μSR and Non-Fermi-Liquid Behavior in Heavy Fermion Systems

Bernal

2000

phys. stat. sol. (b)

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This paper deals with nuclear magnetic resonance (NMR) and muon spin rotation (μSR) experiments in heavy‐fermion (HF) systems which display non‐Fermi‐liquid (NFL) behavior. We review in particular our measurements in UCu5—xPdx (x = 1 and 1.5), and discuss how these experiments have contributed to our current understanding of the role of disorder in NFL properties. Recent experiments on CeRhRuSi2 are also described. Our experiments reveal the usefulness of NMR and —SR as ideal tools for detecting structural or intrinsic disorder and characterizing magnetic inhomogeneities in stoichiometric “ordered compounds”, which appear pristine to other techniques such as X‐rays and neutron scattering.

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Instabilities of a Fermi Gas with Nested Fermi Surfaces

Schlottmann

2017

Annalen der Physik

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The nesting of the Fermi surfaces of an electron and a hole pocket separated by a vector Q commensurate with the lattice in conjunction with the interaction between the quasiparticles can give rise to a rich phase diagram. Of particular importance is itinerant antiferromagnetic order in the context of pnictides and heavy fermion compounds. By mismatching the nesting the order can gradually be suppressed and as the Néel temperature tends to zero a quantum critical point is obtained. A superconducting dome above the quantum critical point can be induced by the transfer of pairs of electrons between the pockets. The conditions under which such a dome arises are studied. In addition numerous other phases may arise, e.g. charge density waves, non-Fermi liquid behavior, non-s-wave superconductivity, Pomeranchuk instabilities of the Fermi surface, nematic order, and phases with persistent orbital currents.

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Non fermi liquid behavior in strongly correlated f-electron materials

Cited by 204 publications

References 23 publications

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

NMR/μSR and Non-Fermi-Liquid Behavior in Heavy Fermion Systems

Instabilities of a Fermi Gas with Nested Fermi Surfaces

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