scholarly journals Correlation between scale-invariant normal-state resistivity and superconductivity in an electron-doped cuprate

2019 ◽  
Vol 5 (5) ◽  
pp. eaav6753 ◽  
Author(s):  
Tarapada Sarkar ◽  
P. R. Mandal ◽  
N. R. Poniatowski ◽  
M. K. Chan ◽  
Richard L. Greene
Keyword(s):  
Normal State ◽  
Applied Field ◽  
Quantum Critical Point ◽  
Scaling Relation ◽  
Normal State Resistivity ◽  
Scale Invariant ◽  
Superconducting Cuprates ◽  
Metal State ◽  
Quantum Critical ◽  
Standing Problem

An understanding of the normal state in the high-temperature superconducting cuprates is crucial to the ultimate understanding of the long-standing problem of the origin of the superconductivity itself. This so-called “strange metal” state is thought to be associated with a quantum critical point (QCP) hidden beneath the superconductivity. In electron-doped cuprates—in contrast to hole-doped cuprates—it is possible to access the normal state at very low temperatures and low magnetic fields to study this putative QCP and to probe theT➔ 0 K state of these materials. We report measurements of the low-temperature normal-state magnetoresistance (MR) of the n-type cuprate system La2−xCexCuO4and find that it is characterized by a linear-in-field behavior, which follows a scaling relation with applied field and temperature, for doping (x) above the putative QCP (x= 0.14). The magnitude of the unconventional linear MR decreases asTcdecreases and goes to zero at the end of the superconducting dome (x~ 0.175) above which a conventional quadratic MR is found. These results show that there is a strong correlation between the quantum critical excitations of the strange metal state and the high-Tcsuperconductivity.

scholarly journals Normal-state Hall Angle and Magnetoresistance in Quasi-2D Heavy Fermion CeCoIn5near a Quantum Critical Point

2004 ◽  
Vol 73 (1) ◽  
pp. 5-8 ◽  
Author(s):  
Y. Nakajima ◽  
K. Izawa ◽  
Y. Matsuda ◽  
S. Uji ◽  
T. Terashima ◽  
...  
Keyword(s):  
Critical Point ◽  
Normal State ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Hall Angle ◽  
Quantum Critical

Normal state properties at a field-tuned quantum-critical point in the heavy-fermion superconductor

2008 ◽  
Vol 403 (5-9) ◽  
pp. 943-945 ◽  
Author(s):  
Tuson Park ◽  
Y. Tokiwa ◽  
E.D. Bauer ◽  
F. Ronning ◽  
R. Movshovich ◽  
...  
Keyword(s):  
Critical Point ◽  
Normal State ◽  
Heavy Fermion ◽  
Quantum Critical Point ◽  
Normal State Properties ◽  
Quantum Critical ◽  
Heavy Fermion Superconductor

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

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 The physics of the stripe quantum critical point in the superconducting cuprates

2000 ◽  
Vol 341-348 ◽  
pp. 1715-1718 ◽  
Author(s):  
C. Di Castro ◽  
L. Benfatto ◽  
S. Caprara ◽  
C. Castellani ◽  
M. Grilli
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Superconducting Cuprates ◽  
Quantum Critical

scholarly journals Nematic fluctuations in the cuprate superconductor Bi2Sr2CaCu2O8+δ

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
N. Auvray ◽  
B. Loret ◽  
S. Benhabib ◽  
M. Cazayous ◽  
R. D. Zhong ◽  
...  
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Van Hove Singularity ◽  
Superconducting Cuprates ◽  
Unconventional Superconductors ◽  
Pseudogap Phase ◽  
Electronic Raman Scattering ◽  
Quantum Critical ◽  
Canonical Quantum ◽  
Metal Phases

AbstractEstablishing the presence and the nature of a quantum critical point in their phase diagram is a central enigma of the high-temperature superconducting cuprates. It could explain their pseudogap and strange metal phases, and ultimately their high superconducting temperatures. Yet, while solid evidences exist in several unconventional superconductors of ubiquitous critical fluctuations associated to a quantum critical point, in the cuprates they remain undetected until now. Here using symmetry-resolved electronic Raman scattering in the cuprate $${\mathrm{Bi}}_2{\mathrm{Sr}}_2{\mathrm{CaCu}}_2{\mathrm{O}}_{8+\delta}$$Bi2Sr2CaCu2O8+δ, we report the observation of enhanced electronic nematic fluctuations near the endpoint of the pseudogap phase. While our data hint at the possible presence of an incipient nematic quantum critical point, the doping dependence of the nematic fluctuations deviates significantly from a canonical quantum critical scenario. The observed nematic instability rather appears to be tied to the presence of a van Hove singularity in the band structure.

scholarly journals Tuning the charge density wave quantum critical point and the appearance of superconductivity in TiSe2

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Sangyun Lee ◽  
Tae Beom Park ◽  
Jihyun Kim ◽  
Soon-Gil Jung ◽  
Won Kyung Seong ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical
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