Anomalous temperature and symmetry-dependent electronic excitations in GdB6

2021 ◽  
pp. 160507
Author(s):  
Yu. S. Ponosov ◽  
D.Y. Novoselov
Keyword(s):  
Electronic Excitations ◽  
Anomalous Temperature

Use of LaB6 for a High Quality, Small Energy Spread Beam in an Electron Velocity Spectrometer

1976 ◽  
Vol 34 ◽  
pp. 534-535 ◽  
Author(s):  
P. E. Batson ◽  
C. H. Chen ◽  
J. Silcox
Keyword(s):  
High Temperature ◽  
Energy Resolution ◽  
Electron Velocity ◽  
Electronic Excitations ◽  
Small Energy ◽  
Small Intensity ◽  
Good Energy ◽  
Spectrometer System ◽  
Electron Energy Loss ◽  
Very High

Electron energy loss experiments combined with microscopy have proven to be a valuable tool for the exploration of the structure of electronic excitations in materials. These types of excitations, however, are difficult to measure because of their small intensity. In a usual situation, the filament of the microscope is run at a very high temperature in order to present as much intensity as possible at the specimen. This results in a degradation of the ultimate energy resolution of the instrument due to thermal broadening of the electron beam.We report here observations and measurements on a new LaB filament in a microscope-velocity spectrometer system. We have found that, in general, we may retain a good energy resolution with intensities comparable to or greater than those available with the very high temperature tungsten filament. We have also explored the energy distribution of this filament.

Defect formation in solids by decay of electronic excitations

1985 ◽  
Vol 147 (11) ◽  
pp. 523 ◽  
Author(s):  
M.I. Klinger ◽  
Ch.B. Lushchik ◽  
T.V. Mashovets ◽  
G.A. Kholodar' ◽  
M.K. Sheinkman ◽  
...  
Keyword(s):  
Defect Formation ◽  
Electronic Excitations

Bandgap engineering in SrTiO3 thin films by electronic excitations: A synchrotron-based spectroscopic study

2021 ◽  
Vol 195 ◽  
pp. 113725
Author(s):  
Vishnu Kumar ◽  
Anuradha Bhogra ◽  
Manju Bala ◽  
Hung-Wei Kuo ◽  
Chi-Liang Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Spectroscopic Study ◽  
Electronic Excitations ◽  
Bandgap Engineering

scholarly journals Low-temperature investigation of electronic excitations in wide-gap materials doped with RE3+ or Cr3+ ions

2011 ◽  
Vol 111 (3) ◽  
pp. 434-440 ◽  
Author(s):  
A. Lushchik ◽  
Ch. Lushchik ◽  
I. Kudryavtseva ◽  
A. Maaroos ◽  
F. Savikhin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electronic Excitations ◽  
Wide Gap

scholarly journals Multilevel CC2 and CCSD in Reduced Orbital Spaces: Electronic Excitations in Large Molecular Systems

2021 ◽  
Vol 17 (2) ◽  
pp. 714-726
Author(s):  
Sarai Dery Folkestad ◽  
Eirik F. Kjønstad ◽  
Linda Goletto ◽  
Henrik Koch
Keyword(s):  
Electronic Excitations ◽  
Molecular Systems

scholarly journals Analyzing and Visualizing Spatiotemporal Patterns of El Niño Teleconnections Using Attribute Trajectories

Atmosphere ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 414
Author(s):  
Long Zhang ◽  
Bert Van Schaeybroeck ◽  
Steven Caluwaerts ◽  
Piet Termonia ◽  
Nico Van de Weghe
Keyword(s):  
Data Structures ◽  
El Niño ◽  
Temperature Increase ◽  
El Nino ◽  
Global Climate ◽  
Spatiotemporal Patterns ◽  
New Method ◽  
Anomalous Temperature ◽  
General Dynamics ◽  
The Relationship

El Niño influences the global climate through teleconnections that are not constant in space and time. In order to study and visualize the spatiotemporal patterns of the El Niño teleconnections, a new method inspired by the concept of attribute trajectories is proposed. The coordinates of the trajectories are the normalized anomalies of the relevant meteorological variables in El Niño. The data structures called flocks are extracted from the trajectories to indicate the regions that are subject to the same type of El Niño teleconnection for a certain period. It is then shown how these structures can be used to get a detailed, spatiotemporal picture of the dynamics of the El Niño teleconnections. The comparison between the flocks of the same temporal scale reveals the general dynamics of the teleconnection, while the analysis among the flocks of different temporal scales indicates the relationship between the coverage and their duration. As an illustration of this method, the spatiotemporal patterns of the anomalous temperature increase caused by El Niño are presented and discussed at the monthly and seasonal scales. This study demonstrates the capability of the proposed method in analyzing and visualizing the spatiotemporal patterns of the teleconnections.

scholarly journals Anomalous Temperature and Field Behaviors of Magnetization in Cubic Lattice Frustrated Ferromagnets

2015 ◽  
Vol 233-234 ◽  
pp. 3-7
Author(s):  
A.N. Ignatenko ◽  
Andrey A. Katanin ◽  
Valentin Yu. Irkhin
Keyword(s):  
Experimental Data ◽  
Monte Carlo Simulation ◽  
Low Temperatures ◽  
Strong Field ◽  
Wave Spectrum ◽  
Exchange Interactions ◽  
Thermal Fluctuations ◽  
Anomalous Temperature ◽  
Cubic Lattice ◽  
Spin Wave Spectrum

Thermodynamic properties of cubic Heisenberg ferromagnets with competing exchange interactions are considered near the frustration point where the coefficient D in the spin-wave spectrum Ek ~ Dk2vanishes. Within the Dyson-Maleev formalism it is found that at low temperatures thermal fluctuations stabilize ferromagnetism by increasing the value of D. For not too strong frustration this leads to an unusual "concave" shape of the temperature dependence of magnetization, which is in agreement with experimental data on the europium chalcogenides. Anomalous temperature behavior of magnetization is confirmed by Monte Carlo simulation. Strong field dependence of magnetization (paraprocess) at finite temperature is found near the frustration point.

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