Optical Conductivity and Spatial Inhomogeneity in Cuprate Superconductors

2007 ◽  
pp. 299-324 ◽  
Author(s):  
J. Orenstein
Keyword(s):  
Optical Conductivity ◽  
Cuprate Superconductors ◽  
Spatial Inhomogeneity

scholarly journals Singular charge fluctuations at a magnetic quantum critical point

Science ◽  
2020 ◽  
Vol 367 (6475) ◽  
pp. 285-288 ◽  
Author(s):  
L. Prochaska ◽  
X. Li ◽  
D. C. MacFarland ◽  
A. M. Andrews ◽  
M. Bonta ◽  
...  
Keyword(s):  
Optical Conductivity ◽  
Heavy Fermion ◽  
Molecular Beam ◽  
Cuprate Superconductors ◽  
Quantum Critical Point ◽  
Charge Fluctuations ◽  
Quantum Matter ◽  
Temperature Scaling ◽  
Landau Quantum ◽  
Quantum Critical

Strange metal behavior is ubiquitous in correlated materials, ranging from cuprate superconductors to bilayer graphene, and may arise from physics beyond the quantum fluctuations of a Landau order parameter. In quantum-critical heavy-fermion antiferromagnets, such physics may be realized as critical Kondo entanglement of spin and charge and probed with optical conductivity. We present terahertz time-domain transmission spectroscopy on molecular beam epitaxy–grown thin films of YbRh2Si2, a model strange-metal compound. We observed frequency over temperature scaling of the optical conductivity as a hallmark of beyond-Landau quantum criticality. Our discovery suggests that critical charge fluctuations play a central role in the strange metal behavior, elucidating one of the long-standing mysteries of correlated quantum matter.

scholarly journals Theory of the optical conductivity in the cuprate superconductors

1997 ◽  
Vol 56 (18) ◽  
pp. 11931-11941 ◽  
Author(s):  
Branko P. Stojković ◽  
David Pines
Keyword(s):  
Optical Conductivity ◽  
Cuprate Superconductors

The anomalous optical conductivity in hole-doped cuprate superconductors

2018 ◽  
Vol 270 ◽  
pp. 87-91 ◽  
Author(s):  
He Gao ◽  
Feng Yuan ◽  
Shaou Chen ◽  
Huaisong Zhao
Keyword(s):  
Optical Conductivity ◽  
Cuprate Superconductors

The non-Drude type of optical conductivity in cuprates

2017 ◽  
Vol 31 (18) ◽  
pp. 1750204 ◽  
Author(s):  
Yunxue Teng ◽  
He Gao ◽  
Chunsheng Ma ◽  
Feng Yuan ◽  
Huaisong Zhao
Keyword(s):  
Optical Conductivity ◽  
Normal State ◽  
Cuprate Superconductors ◽  
Narrow Band ◽  
Mean Field Theory ◽  
Infrared Region ◽  
Peak Position ◽  
Zero Energy ◽  
Infrared Band ◽  
Mid Infrared

There is a long-standing issue that the optical conductivity in normal-state of cuprate superconductors deviates the conventional Drude type marked by [Formula: see text] dependence, exhibiting two main components from underdoping to overdoping, a narrow band peaked around zero energy and a broadband centered in the mid-infrared region called mid-infrared band. Within the renormalized t-J model and self-consistent mean field theory, we discuss the doping and energy dependence of optical conductivity in cuprate superconductors. Our results show that the appearance of the pseudogap in normal state is responsible for anomalous optical conductivity, giving rise to the mid-infrared band. In particular, in analogy to the doping dependence of pseudogap, optical conductivity is also strongly doping dependent. By increasing the doping concentration, the spectral weight of the optical conductivity suppressed strongly in underdoped region increases quickly, and the peak position of the mid-infrared band moves towards to the lower energy region, then incorporates into the narrow band centered in zero energy in the heavily overdoped region.

Optical conductivity and electronic Raman response of cuprate superconductors

2010 ◽  
Vol 470 ◽  
pp. S185-S187
Author(s):  
A. Ványolos ◽  
B. Dóra ◽  
A. Virosztek
Keyword(s):  
Optical Conductivity ◽  
Cuprate Superconductors ◽  
Raman Response

scholarly journals Optical conductivity of overdoped cuprate superconductors: Application to La2−xSrxCuO4

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
N. R. Lee-Hone ◽  
V. Mishra ◽  
D. M. Broun ◽  
P. J. Hirschfeld
Keyword(s):  
Optical Conductivity ◽  
Cuprate Superconductors

scholarly journals Effect of a normal-state pseudogap on optical conductivity in underdoped cuprate superconductors

1999 ◽  
Vol 60 (21) ◽  
pp. 14888-14892 ◽  
Author(s):  
T. Dahm ◽  
D. Manske ◽  
L. Tewordt
Keyword(s):  
Optical Conductivity ◽  
Normal State ◽  
Cuprate Superconductors

Quantitative structure determination of interfaces through Z-contrast imaging and electron energy loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 104-105
Author(s):  
S. J. Pennycook ◽  
P. D. Nellist ◽  
N. D. Browning ◽  
P. A. Langjahr ◽  
M. Rühle
Keyword(s):  
Grain Boundaries ◽  
Cuprate Superconductors ◽  
Structure Refinement ◽  
3D Structure ◽  
Real Space ◽  
Contrast Imaging ◽  
Coordination Polyhedra ◽  
Burgers Vector ◽  
Z Contrast ◽  
Contrast Image

The simultaneous use of Z-contrast imaging with parallel detection EELS in the STEM provides a powerful means for determining the atomic structure of grain boundaries. The incoherent Z-contrast image of the high atomic number columns can be directly inverted to their real space arrangement, without the use of preconceived structure models. Positions and intensities may be accurately quantified through a maximum entropy analysis. Light elements that are not visible in the Z-contrast image can be studied through EELS; their coordination polyhedra determined from the spectral fine structure. It even appears feasible to contemplate 3D structure refinement through multiple scattering calculations.The power of this approach is illustrated by the recent study of a series of SrTiC>3 bicrystals, which has provided significant insight into some of the basic issues of grain boundaries in ceramics. Figure 1 shows the structural units deduced from a set of 24°, 36° and 65° symmetric boundaries, and 24° and 45° asymmetric boundaries. It can be seen that apart from unit cells and fragments from the perfect crystal, only three units are needed to construct any arbitrary tilt boundary. For symmetric boundaries, only two units are required, each having the same Burgers, vector of a<100>. Both units are pentagons, on either the Sr or Ti sublattice, and both contain two columns of the other sublattice, imaging in positions too close for the atoms in each column to be coplanar. Each column was therefore assumed to be half full, with the pair forming a single zig-zag column. For asymmetric boundaries, crystal geometry requires two types of dislocations; the additional unit was found to have a Burgers’ vector of a<110>. Such a unit is a larger source of strain, and is especially important to the transport characteristics of cuprate superconductors. These zig-zag columns avoid the problem of like-ion repulsion; they have also been seen in TiO2 and YBa2Cu3O7-x and may be a general feature of ionic materials.

CRITICAL STATE MODEL FOR CUPRATE SUPERCONDUCTORS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2231-C8-2232
Author(s):  
A. M. Portis ◽  
M. Stalder ◽  
G. Stefanicki ◽  
F. Waldner ◽  
M. Warden
Keyword(s):  
Critical State ◽  
Cuprate Superconductors ◽  
Critical State Model ◽  
State Model
Sign in / Sign up

Export Citation Format

Share Document