scholarly journals Dissipation-driven strange metal behavior

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Sergio Caprara ◽  
Carlo Di Castro ◽  
Giovanni Mirarchi ◽  
Götz Seibold ◽  
Marco Grilli
Keyword(s):  
Fermi Liquid ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Isotropic Scattering ◽  
Metallic Behavior ◽  
Quantum Critical Points ◽  
Superconducting Cuprates ◽  
Dynamical Fluctuations ◽  
Quantum Critical ◽  
Temperature Resistivity

AbstractAnomalous metallic properties are often observed in the proximity of quantum critical points, with violation of the Fermi Liquid paradigm. We propose a scenario where, near the quantum critical point, dynamical fluctuations of the order parameter with finite correlation length mediate a nearly isotropic scattering among the quasiparticles over the entire Fermi surface. This scattering produces a strange metallic behavior, which is extended to the lowest temperatures by an increase of the damping of the fluctuations. We phenomenologically identify one single parameter ruling this increasing damping when the temperature decreases, accounting for both the linear-in-temperature resistivity and the seemingly divergent specific heat observed, e.g., in high-temperature superconducting cuprates and some heavy-fermion metals.

scholarly journals Dissipation-driven Strange Metal Behavior

2021 ◽  
Author(s):  
Marco Grilli ◽  
Sergio Caprara ◽  
Carlo Di Castro ◽  
Giovanni Mirarchi ◽  
Goetz Seibold
Keyword(s):  
Fermi Liquid ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Isotropic Scattering ◽  
Metallic Behavior ◽  
Quantum Critical Points ◽  
Superconducting Cuprates ◽  
Dynamical Fluctuations ◽  
Quantum Critical ◽  
Temperature Resistivity

Abstract Anomalous metallic properties are often observed in the proximity of quantum critical points, with violation of the Fermi Liquid paradigm. We propose a scenario where, near the quantum critical point, dynamical fluctuations of the order parameter with finite correlation length mediate a nearly isotropic scattering among the quasiparticles over the entire Fermi surface. This scattering produces an anomalous metallic behavior, which is extended to the lowest temperatures by an increase of the damping of the fluctuations. We phenomenologically identify one single parameter ruling this increasing damping when the temperature decreases, accounting for both the linear-in-temperature resistivity and the seemingly divergent specific heat observed, e.g., in high-temperature superconducting cuprates and some heavy-fermion metals

Fermi liquid instabilities and superconductivity near quantum critical points in f-electron materials

2003 ◽  
Vol 802 ◽  
Author(s):  
M. B. Maple ◽  
N. A. Frederick ◽  
J. R. Jeffries ◽  
P.-C. Ho ◽  
V. S. Zapf
Keyword(s):  
Heavy Fermion ◽  
Critical Concentration ◽  
Quantum Critical Point ◽  
Electric Quadrupole ◽  
Residual Resistivity ◽  
Quadrupole Moments ◽  
Quantum Critical Points ◽  
Break Time ◽  
Quantum Critical ◽  
Skutterudite Compound

ABSTRACTRecent experiments on single crystals of the compounds CeRh1−xCoxIn5 and PrOs4Sb12 are briefly reviewed. The temperature-composition (T-x) phase diagram of the heavy fermion pseudoternary system CeRh1−xCoxIn5, delineating the regions in which superconductivity, antiferromagnetism, and the coexistence of these two phenomena occur, has been established. Entropy vs x isotherms and residual resistivity vs x plots exhibit peaks near the critical concentration xcr ≈ 0.8 at which the Néel temperature appears to vanish (quantum critical point). The filled skutterudite compound PrOs4Sb12 exhibits unconventional superconductivity below Tc = 1.85 K that involves heavy fermion quasiparticles with an effective mass m* ≈ 50 me, where me is the mass of the free electron. The unconventional superconducting state appears to consist of several distinct superconducting phases and to break time reversal symmetry. A high field ordered phase occurs below ∼ 1 K and between ∼ 4.5 T and ∼ 15 T that appears to be associated with quadrupolar order. The heavy fermion state and superconductivity in PrOs4Sb12 may originate from the interaction between Pr3+ electric quadrupole moments and the charges of the conduction electrons. When Ru is substituted for Os in PrOs4Sb12, a minimum in Tc occurs at Pr(Os0.4Ru0.6)4Sb12, suggesting a competition between two types of superconductivity.

scholarly journals Transport Anomalies and Marginal-Fermi-Liquid Effects at a Quantum Critical Point

2000 ◽  
Vol 85 (21) ◽  
pp. 4602-4605 ◽  
Author(s):  
D. Belitz ◽  
T. R. Kirkpatrick ◽  
R. Narayanan ◽  
Thomas Vojta
Keyword(s):  
Critical Point ◽  
Fermi Liquid ◽  
Quantum Critical Point ◽  
Marginal Fermi Liquid ◽  
Quantum Critical

scholarly journals Non-Fermi-liquid types of behavior associated with a magnetic quantum critical point in Sr(Co1−xNix)2As2 single crystals

2019 ◽  
Vol 100 (9) ◽  
Author(s):  
N. S. Sangeetha ◽  
L.-L. Wang ◽  
A. V. Smirnov ◽  
V. Smetana ◽  
A.-V. Mudring ◽  
...  
Keyword(s):  
Critical Point ◽  
Single Crystals ◽  
Fermi Liquid ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Possible quantum critical behavior revealed by the critical current density of hole doped high-Tc cuprates in comparison to heavy fermion superconductors

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
S. H. Naqib ◽  
R. S. Islam
Keyword(s):  
Critical Current Density ◽  
Copper Oxide ◽  
Critical Point ◽  
Critical Current ◽  
Current Density ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors ◽  
Quantum Critical

Abstract The superconducting critical current density, Jc, in hole doped cuprates show strong dependence on the doped hole content, p, within the copper oxide plane(s). The doping dependent Jc mainly exhibits the variation of the intrinsic depairing critical current density as p is varied. Jc(p) tends to peak at p ~ 0.185 in copper oxide superconductors. This particular value of the hole content, often termed as the critical hole concentration, has several features putative to a quantum critical point (QCP). Very recently, the pressure dependences of the superconducting transition temperature (Tc) and the critical current (Ic) in pure CeRhIn5 and Sn doped CeRhIn5 heavy fermion compounds have been reported (Nature Communications (2018) 9:44, 10.1038/s41467-018-02899-5). The critical pressure demarcates an antiferromagnetic quantum critical point where both Tc and Ic are maximized. We have compared and contrasted this behavior with those found for Y1−xCaxBa2Cu3O7−δ in this brief communication. The resemblance of the systematic behavior of the critical current with pressure and hole content between heavy fermion systems and hole doped cuprates is significant. This adds to the circumstantial evidence that quantum critical physics probably plays a notable role behind the unconventional normal and superconducting state properties of copper oxide superconductors.

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