Anomalous specific heat of liquid 3He above the superfluid transition temperature

1981 ◽  
Vol 43 (1-2) ◽  
pp. 17-24
Author(s):  
A. Pal ◽  
P. Bhattacharyya
Keyword(s):  
Transition Temperature ◽  
Specific Heat ◽  
Superfluid Transition

scholarly journals Superfluid Transition and Specific Heat of the 2D x-y Model: Monte Carlo Simulation

2021 ◽  
Vol 11 (11) ◽  
pp. 4931
Author(s):  
Phong H. Nguyen ◽  
Massimo Boninsegni
Keyword(s):  
Thin Films ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Transition Temperature ◽  
Specific Heat ◽  
Large Scale ◽  
High Accuracy ◽  
Superfluid Transition ◽  
Square Lattice ◽  
Superfluid Fraction

We present results of large-scale Monte Carlo simulations of the 2D classical x-y model on the square lattice. We obtain high accuracy results for the superfluid fraction and for the specific heat as a function of temperature, for systems of size L×L with L up to 212. Our estimate for the superfluid transition temperature is consistent with those furnished in all previous studies. The specific heat displays a well-defined peak, whose shape and position are independent of the size of the lattice for L>28, within the statistical uncertainties of our calculations. The implications of these results on the interpretation of experiments on adsorbed thin films of 4He are discussed.

EFFECT OF COOLING RATE ON THE TRANSITION TEMPERATURE IN Bi–Pb–Sr–Ca–Cu–O SYSTEM

1990 ◽  
Vol 04 (04) ◽  
pp. 293-299
Author(s):  
YUGUI WANG ◽  
JINSONG WANG ◽  
NANLIN WANG ◽  
XINPING JIAO ◽  
GUCHANG HAN ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Specific Heat ◽  
Cooling Rate ◽  
Volume Fraction ◽  
Oxygen Deficiency ◽  
Ac Susceptibility ◽  
Rapid Quenching ◽  
Nominal Composition ◽  
Unit Cell Size ◽  
Superconducting Volume Fraction

The resistance and ac susceptibility measurements show that cooling rate of the cast-annealing samples in heat treatment process has some effect on the 110 K superconducting phase in Bi–Pb–Sr–Ca–Cu–O system. Rapid quenching of the sample in air from 845°C causes oxygen deficiency in lattice and brings about a trifling change of unit cell size along c-axis direction. The dc magnetization and specific heat anomaly ∆c measurements demonstrate that fast cooling rate can reduce the transition temperature of high T c phase and the lower critical field, and weaken the pinning forces for vertex lines. The peak value of specific heat anomaly of the sample with nominal composition of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 4.5 O y is still small in comparison with YBa 2 Cu 3 O 7. From the magnetization curve we can estimate that the superconducting volume fraction is about 20%.

Superfluid transition in a cylindrical pore: Specific-heat scaling function

1999 ◽  
Vol 60 (2) ◽  
pp. R746-R748 ◽  
Author(s):  
Saugata Bhattacharyya ◽  
J. K. Bhattacharjee
Keyword(s):  
Specific Heat ◽  
Scaling Function ◽  
Superfluid Transition ◽  
Cylindrical Pore
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