scholarly journals Hidden Fermi-liquid Charge Transport in the Antiferromagnetic Phase of the Electron-Doped Cuprate Superconductors

2016 ◽  
Vol 117 (19) ◽  
Author(s):  
Yangmu Li ◽  
W. Tabis ◽  
G. Yu ◽  
N. Barišić ◽  
M. Greven
Keyword(s):  
Charge Transport ◽  
Fermi Liquid ◽  
Cuprate Superconductors ◽  
Antiferromagnetic Phase

scholarly journals SPECTRAL ANOMALY AND HIGH TEMPERATURE SUPERCONDUCTORS

1996 ◽  
Vol 10 (07) ◽  
pp. 805-845 ◽  
Author(s):  
LAN YIN ◽  
SUDIP CHAKRAVARTY
Keyword(s):  
High Temperature ◽  
Spectral Function ◽  
Superconducting State ◽  
Fermi Liquid ◽  
Cuprate Superconductors ◽  
High Temperature Superconductors ◽  
Universality Class ◽  
Scaling Relation ◽  
Critical System ◽  
Spectral Anomaly

Spectral anomaly for interacting fermions is characterized by the spectral function A ([k − k F ], ω) satisfying the scaling relation A (Λy1 [k − k F ], Λy2 ω) =ΛyA A ([k − k F ], ω), where y1, y2, and yA are the exponents defining the universality class. For a Fermi liquid y1 = 1, y2 = 1, yA = −1; all other values of the exponents are termed anomalous. In this paper, an example for which y1 = 1, y2 = 1, but yA = α − 1 is considered in detail. Attractive interaction added to such a critical system leads to a novel superconducting state, which is explored and its relevance to high temperature cuprate superconductors is discussed.

A tied Fermi liquid to Luttinger liquid model for the explanation of nonlinear transport in conducting polymers

2020 ◽  
Author(s):  
Jiawei Wang ◽  
Jiebin Niu ◽  
Bin Shao ◽  
Guanhua YANG ◽  
Congyan Lu ◽  
...  
Keyword(s):  
Conducting Polymers ◽  
Charge Transport ◽  
Fermi Liquid ◽  
Fermi Liquids ◽  
Nonlinear Transport ◽  
Luttinger Liquids ◽  
Resistive Network ◽  
Light Emitting ◽  
Organic Conjugated Polymers ◽  
Liquid Model

Abstract Organic conjugated polymers demonstrate great potential in the transistor, solar cell and light-emitting diodes. The performances of those devices are fundamentally governed by charge transport within the active materials. However, the morphology-property relationships and the underpinning charge transport mechanism in polymers remain unclear. Particularly, whether the nonlinear charge transport in doped conducting polymers, i.e., anomalous non-Ohmic behaviors at low temperature, is appropriately formulated within non-Fermi liquid picture is not clear. In this work, via varying crystalline degrees of samples, we carried out systematic investigations on the charge transport nonlinearity in conducting polymers. Possible charge carriers’ dimensionality was discussed with experiments when varying the molecular chain’s crystalline orders. A heterogeneous-resistive-network (HRN) model was proposed based on the tied link between Fermi liquids (FL) and Luttinger liquids (LL), related to the high-ordered crystalline zones and weak-coupled amorphous regions, respectively. This mesoscopic HRN model is experimentally supported by precise electrical and microstructural characterizations, together with theoretic evaluations. Significantly, such model well describes the nonlinear transport behaviors in conducting polymers universally and provides new insights into the microstructure-correlated charge transport in organic conducting/semiconducting systems.

scholarly journals Luttinger-volume violating Fermi liquid in the pseudogap phase of the cuprate superconductors

2012 ◽  
Vol 85 (13) ◽  
Author(s):  
Jia-Wei Mei ◽  
Shinji Kawasaki ◽  
Guo-Qing Zheng ◽  
Zheng-Yu Weng ◽  
Xiao-Gang Wen
Keyword(s):  
Fermi Liquid ◽  
Cuprate Superconductors ◽  
Pseudogap Phase

scholarly journals Temperature-Independent Cuprate Pseudogap from Planar Oxygen NMR

2020 ◽  
Vol 5 (4) ◽  
pp. 66 ◽  
Author(s):  
Jakob Nachtigal ◽  
Marija Avramovska ◽  
Andreas Erb ◽  
Danica Pavićević ◽  
Robin Guehne ◽  
...  
Keyword(s):  
Fermi Liquid ◽  
Exchange Coupling ◽  
Cuprate Superconductors ◽  
Nmr Relaxation ◽  
Nuclear Relaxation ◽  
Specific Heat Data ◽  
Optimal Doping ◽  
Gap States ◽  
Shift Data ◽  
Heat Data

Planar oxygen nuclear magnetic resonance (NMR) relaxation and shift data from all cuprate superconductors available in the literature are analyzed. They reveal a temperature-independent pseudogap at the Fermi surface, which increases with decreasing doping in family-specific ways, i.e., for some materials, the pseudogap is substantial at optimal doping while for others it is nearly closed at optimal doping. The states above the pseudogap, or in its absence are similar for all cuprates and doping levels, and Fermi liquid-like. If the pseudogap is assumed exponential it can be as large as about 1500 K for the most underdoped systems, relating it to the exchange coupling. The pseudogap can vary substantially throughout a material, being the cause of cuprate inhomogeneity in terms of charge and spin, so consequences for the NMR analyses are discussed. This pseudogap appears to be in agreement with the specific heat data measured for the YBaCuO family of materials, long ago. Nuclear relaxation and shift show deviations from this scenario near Tc, possibly due to other in-gap states.

scholarly journals Emergent gauge fields and the high-temperature superconductors

2016 ◽  
Vol 374 (2075) ◽  
pp. 20150248 ◽  
Author(s):  
Subir Sachdev
Keyword(s):  
Fermi Surface ◽  
Free Electron ◽  
Fermi Liquid ◽  
Degrees Of Freedom ◽  
Electron State ◽  
Cuprate Superconductors ◽  
High Temperature Superconductors ◽  
Gauge Fields ◽  
Total Density ◽  
Density Of Electrons

The quantum entanglement of many states of matter can be represented by electric and magnetic fields, much like those found in Maxwell’s theory. These fields ‘emerge’ from the quantum structure of the many-electron state, rather than being fundamental degrees of freedom of the vacuum. I review basic aspects of the theory of emergent gauge fields in insulators in an intuitive manner. In metals, Fermi liquid (FL) theory relies on adiabatic continuity from the free electron state, and its central consequence is the existence of long-lived electron-like quasi-particles around a Fermi surface enclosing a volume determined by the total density of electrons, via the Luttinger theorem. However, long-range entanglement and emergent gauge fields can also be present in metals. I focus on the ‘fractionalized Fermi liquid’ (FL*) state, which also has long-lived electron-like quasi-particles around a Fermi surface; however, the Luttinger theorem on the Fermi volume is violated, and this requires the presence of emergent gauge fields, and the associated loss of adiabatic continuity with the free electron state. Finally, I present a brief survey of some recent experiments in the hole-doped cuprate superconductors, and interpret the properties of the pseudogap regime in the framework of the FL* theory. This article is part of the themed issue ‘Unifying physics and technology in light of Maxwell's equations’.

NMR evidence for metallic-to-antiferromagnetic phase separation in cuprate superconductors

1993 ◽  
Vol T49A ◽  
pp. 124-130 ◽  
Author(s):  
M Mehring ◽  
M Baehr ◽  
P Gergen ◽  
J Groß ◽  
C Kessler
Keyword(s):  
Phase Separation ◽  
Cuprate Superconductors ◽  
Antiferromagnetic Phase
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