Interaction of Thin Ga Overlayer with InP(110): a Photoemission Study

1988 ◽  
Vol 143 ◽  
Author(s):  
R. Cao ◽  
K. Miyano ◽  
T. Kendelewicz ◽  
I. Lindau ◽  
W. E. Spicer
Keyword(s):  
Low Temperature ◽  
Fermi Level ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Replacement Reaction ◽  
High Coverage ◽  
Fermi Level Pinning ◽  
Different Temperatures ◽  
Photoemission Study ◽  
Low Coverage

AbstractPhotoemission study of the Ga/InP(110) interface, in particular at the In 4d cooper minimum (CM) reveals that the growth of the deposited Ga on InP(110) at room temperature (RT) has two modes: chemisorption at low coverage and metallic island formation at high coverage, whereas the Ga overlayer is much more uniform at 80K low temperature (LT). A replacement reaction between Ga and InP is found to take place only underneath the Ga islands. Metal screening from the Ga islands is suggested to weaken the substrate bonds and enhance the replacement reaction. Distinct behavior of Fermi level pinning has been observed at different temperatures. This is correlated with the temperature dependence of the overlayer morphology as well as the interfacial reaction.

Fermi level pinning in low‐temperature molecular beam epitaxial GaAs

1992 ◽  
Vol 61 (13) ◽  
pp. 1585-1587 ◽  
Author(s):  
H. Shen ◽  
F. C. Rong ◽  
R. Lux ◽  
J. Pamulapati ◽  
M. Taysing‐Lara ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fermi Level ◽  
Molecular Beam ◽  
Epitaxial Gaas ◽  
Fermi Level Pinning ◽  
Molecular Beam Epitaxial

Effect of Forging Temperature on Microstructure and Tensile Properties in Fe3Al-Based Alloy

1994 ◽  
Vol 364 ◽  
Author(s):  
Y. Yang ◽  
W. Yan ◽  
J. N. Liu ◽  
S. Hanada
Keyword(s):  
Plastic Deformation ◽  
Low Temperature ◽  
Yield Strength ◽  
Grain Boundaries ◽  
Tensile Properties ◽  
Room Temperature ◽  
Annealing Treatment ◽  
Different Temperatures ◽  
Local Plastic Deformation ◽  
Strength And Ductility

AbstractForging processes at two different temperatures are performed to examine the relation between the microstructure and room temperature tensile properties in a Ce doped Fe3Al-based alloy. Results show that the microstructure and the ductility are sensitive to the forging temperature before annealing treatment. Higher yield strength and ductility can be obtained through forging at a relatively low temperature of 750°C followed by annealing at 800°C and 500°C. It is suggested that the formation of non-equilibrium grain boundaries and banded subgrains within carbide-free areas along grain boundaries enhances the local plastic deformation and results in the improvement of ductility. During the initial deformation at room temperature <111> slip is predominant for both microstructures.

Formation of the yttrium/germanium interface: Fermi-level pinning and intermixing at room temperature

2012 ◽  
Vol 100 (9) ◽  
pp. 092110 ◽  
Author(s):  
Z. Q. Liu ◽  
W. K. Chim ◽  
S. Y. Chiam ◽  
J. S. Pan ◽  
C. M. Ng
Keyword(s):  
Fermi Level ◽  
Room Temperature ◽  
Fermi Level Pinning

Low-temperature electrical resistivity and magnetic susceptibility of dilute Mg–Ce alloys

1970 ◽  
Vol 48 (11) ◽  
pp. 1283-1287 ◽  
Author(s):  
F. T. Hedgcock ◽  
B. Petrie
Keyword(s):  
Electrical Resistivity ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Fermi Level ◽  
Magnesium Alloys ◽  
Conduction Electron ◽  
Room Temperature ◽  
Impurity Scattering ◽  
Cerium Ion ◽  
Normal Potential

The electrical resistivity of a series of magnesium alloys containing from 300 to 1041 parts per million of gadolinium has been measured from 4.2 °K to room temperature. No low-temperature anomalies have been observed and it is found that Matthiessen's rule is obeyed extremely well over the whole temperature range studied. The electrical resistivity and magnetic susceptibility measurements indicate that the cerium ion in magnesium is in a triply ionized state, and that the contribution to the resistivity can be almost totally accounted for by assuming normal potential impurity scattering. This suggests that the f level of cerium in magnesium lies well below the fermi level of magnesium and that there is very little s–f mixing between the f level of cerium of the conduction electron states of magnesium.

scholarly journals Do fish acclimated to low temperature improve microcirculatory perfusion by adapting red cell rheology?

1995 ◽  
Vol 198 (8) ◽  
pp. 1801-1808
Author(s):  
T Lecklin ◽  
G Nash ◽  
S Egginton
Keyword(s):  
Low Temperature ◽  
Temperature Dependence ◽  
Red Cells ◽  
Fluid Viscosity ◽  
Thermal Environments ◽  
Transit Times ◽  
Different Temperatures ◽  
Membrane Rigidity ◽  
Similar Temperature

We have measured the rheological properties of individual red blood cells from fishes inhabiting different thermal environments and have also investigated the effects on red cells of acute in vitro temperature changes. The membrane shear elastic modulus (rigidity) increased markedly with decreasing temperature, and the dependence was similar if temperature was varied acutely in vitro or if cells were measured at normal body temperatures. Red cells from trout and Notothenia coriiceps had almost equal membrane rigidity at comparable temperatures and showed similar temperature-sensitivity in acute experiments. Entry times of trout cells into narrow (approximately 4 microm diameter) micropipettes also increased during in vitro reduction of temperature, and this could be explained largely by the temperature-dependence expected of aqueous solutions. Perhaps surprisingly, entry times did not vary when trout living at different temperatures were tested at these temperatures. Transit times of individual cells through somewhat larger pores (5 microm) in oligopore filters again increased with decreasing temperature in vitro (partly due to increasing fluid viscosity), but such transit times did show a similar temperature-dependence for cells from trout living at different temperatures. Thus, the temperature-dependence of cellular flow resistance appears to arise from variations in membrane rigidity and in the viscosity of fluid components, along with unquantified variations in components such as microtubular structures (which we found did not influence membrane rigidity but did affect pore entry time) and the cell nucleus. Thermal acclimation did not involve adaptation to compensate for increased membrane rigidity or a large pore transit time, with, at most, minor compensation in entry times into smaller pores. We conclude that impaired cellular rheology is not a major factor influencing circulation in fish at low temperature.

Low Temperature Hydrothermal Synthesis and Sintering of Ba0.6Sr0.4TiO3

2008 ◽  
Vol 368-372 ◽  
pp. 53-55
Author(s):  
Yun Fei Fu ◽  
Pei Feng Zhang ◽  
Hui Qing Fan ◽  
Xiu Li Chen
Keyword(s):  
Dielectric Constant ◽  
Low Temperature ◽  
Room Temperature ◽  
Hydrothermal Process ◽  
Dielectric Anomaly ◽  
Loss Angle ◽  
Synthesis Mechanism ◽  
Dielectric Constant And Loss ◽  
Different Temperatures ◽  
Bst Ceramics

Ba0.6Sr0.4TiO3 nanopowders (~ 80 nm in size) were prepared by low temperature hydrothermal process. The process and synthesis mechanism were discussed in detail. Furthermore, the powders were pressed into disc-shaped pellets and sintered at different temperatures. The frequency dependence of the dielectric constant and loss angle tangent of the sintered BST ceramics are measured from room temperature to 500°C and a diffuse dielectric anomaly by the dielectric relaxation was found.

Photoemission study of chemisorption and Fermi-level pinning at K/GaAs(100) interface with synchrotron radiation

2005 ◽  
Vol 249 (1-4) ◽  
pp. 340-345 ◽  
Author(s):  
M.H. Sun ◽  
T.X. Zhao ◽  
C.Y. Jia ◽  
P.S. Xu ◽  
E.D. Lu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Fermi Level ◽  
Fermi Level Pinning ◽  
Photoemission Study

TRANSITITON FROM A MAGNETIC TO A NONMAGNETIC STATE AS A FUNCTION OF PRESSURE IN MnSi

1993 ◽  
Vol 07 (01n03) ◽  
pp. 887-890 ◽  
Author(s):  
C. PFLEIDERER ◽  
R.H. FRIEND ◽  
G.G. LONZARICH ◽  
N.R. BERNHOEFT ◽  
J. FLOUQUET
Keyword(s):  
Low Temperature ◽  
Curie Temperature ◽  
Temperature Dependence ◽  
Fermi Liquid ◽  
Critical Pressure ◽  
Room Temperature ◽  
Temperature Form ◽  
Marginal Fermi Liquid

We report a study of the temperature dependence of the resistivity ρ(T) of MnSi over the range 20mK to room temperature at hydrostatic pressures of up to 20 kbar. The low temperature form of ρ(T) near the critical pressure Pc=15.5 kbar where the Curie temperature appears to vanish is interpreted in terms of a model of a Marginal Fermi Liquid.

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