10 research outputs found
Coexistence of magnetism and superconductivity in a t-J bilayer
We investigate coexistence of antiferromagnetic and superconducting
correlations in bilayered materials using a two-dimensional t-J model with
couplings across the layers using variational Monte Carlo calculations. It is
found that the underdoped regime supports a coexisting phase, beyond which the
(d-wave) superconducting state becomes stable. Further, the effects of
interplanar coupling parameters on the magnetic and superconducting
correlations as a function of hole doping are studied in details. The magnetic
correlations are found to diminish with increasing interplanar hopping away
from half filling, while the exchange across the layers strengthens interplanar
antiferromagnetic correlations both at and away from half filling. The
superconducting correlations show more interesting features where larger
interplanar hopping considerably reduces planar correlations at optimal doping,
while an opposite behaviour, i.e. stabilisation of the superconducting state is
realised in the overdoped regime, with the interplanar exchange all the while
playing a dormant role.Comment: 8 pages, 9 figures, RevTex4, Submitted to Phys. Rev.
Recommended from our members
Enhancement of Aluminum Alloy Forgings through Rapid Billet Heating
Forging is a manufacturing process in which metal is pressed, pounded or squeezed under great pressure and, often, under high strain rates into high-strength parts known as forgings. The process is typically performed hot by preheating the metal to a desired temperature before it is worked. The forging process can create parts that are stronger than those manufactured by any other metal working process. Forgings are almost always used where reliability and human safety are critical. Forgings are normally component parts contained inside assembled items such airplanes, automobiles, tractors, ships, oil drilling equipment, engines missiles, and all kinds of capital equipment Forgings are stronger than castings and surpass them in predictable strength properties, producing superior strength that is assured, part to part
Effect of heating rate on recrystallization of twin roll cast aluminum
Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 39A(1): pp. 165-170.The effect of heating rate on precipitation and recrystallization behavior in twin roll cast (TRC)
AA3105 has been investigated by three different means: conventional air furnace, controlled
infrared, and lead bath heating. Experimental results showed that as-recrystallized grain size
decreased and became more equiaxed as the annealing heating rate increased. These results were
explained via time-temperature-transformation (TTT) curves for both dispersoid precipitation
and recrystallization. With the faster heating rate, recrystallization could occur before precipitation
of Mn present in the unhomogenized TRC samples. At a heating rate of 50 degree C/s the
material underwent grain growth after recrystallization at 500 degree C. No sign of grain growth was
observed in materials annealed with lower heating rates, 3 degrees C/s, 0.5 degree C/s, and 0.01 degree C/s due to
greater dispersoid precipitation