WHAT CAN WE LEARN FROM COMPARISON BETWEEN CUPRATES AND HE FILMS?: PHASE SEPARATION AND FLUCTUATING SUPERFLUIDITY

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3703-3710 ◽  
Author(s):  
Y. J. UEMURA
Keyword(s):  
Thin Films ◽  
Porous Media ◽  
Phase Separation ◽  
Transition Temperature ◽  
Cuprate Superconductors ◽  
Superfluid Density ◽  
Superfluid Transition ◽  
Strong Correlations ◽  
Underdoped Region

In the underdoped, overdoped, Zn-doped or stripe-forming regions of high-Tc cuprate superconductors (HTSC), the superfluid density ns/m* at T→ 0 shows universal correlations with Tc. Similar strong correlations exist between 2-dimensional superfluid density and superfluid transition temperature in thin films of 4 He in non-porous or porous media, and 4 He /3 He film adsorbed on porous media. Based on analogy between HTSC and He film systems, we propose a model for cuprates where: (1) the overdoped region is characterized by a phase separation similar to 4 He /3 He ; and (2) pair (boson) formation and fluctuating superconductivity occur at separate temperatures above Tc in the underdoped region.

DOPING AND TEMPERATURE DEPENDENCE OF SUPERFLUID DENSITY IN KINETIC ENERGY DRIVEN CUPRATE SUPERCONDUCTORS

2010 ◽  
Vol 24 (29) ◽  
pp. 2845-2854
Author(s):  
ZHEYU HUANG ◽  
HUAISONG ZHAO ◽  
SHIPING FENG
Keyword(s):  
Transition Temperature ◽  
Kinetic Energy ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Cuprate Superconductors ◽  
Superfluid Density ◽  
Linear Temperature Dependence ◽  
Superconducting Transition ◽  
Zero Temperature ◽  
Linear Temperature

Within the kinetic energy driven superconducting mechanism, the doping and temperature dependence of the superfluid density in cuprate superconductors is studied throughout the superconducting dome. It is shown that the superfluid density shows a crossover from the linear temperature dependence at low temperatures to a nonlinear one in the extremely low temperatures. In analogy to the dome-like shape of the doping dependent superconducting transition temperature, the maximal zero-temperature superfluid density occurs around the critical doping δ ≈ 0.195, and then decreases in both lower doped and higher doped regimes.

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.

scholarly journals Modulating the phase transition temperature of giant magnetocaloric thin films by ion irradiation

2017 ◽  
Vol 1 (6) ◽  
Author(s):  
S. Cervera ◽  
M. Trassinelli ◽  
M. Marangolo ◽  
C. Carrétéro ◽  
V. Garcia ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Ion Irradiation

Oxygen off-stoichiometry and phase separation in EuO thin films

2011 ◽  
Vol 84 (15) ◽  
Author(s):  
S. G. Altendorf ◽  
A. Efimenko ◽  
V. Oliana ◽  
H. Kierspel ◽  
A. D. Rata ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Separation

Impact of Surface-Modified Nanoparticles on Glass Transition Temperature and Elastic Modulus of Polymer Thin Films

2007 ◽  
Vol 40 (22) ◽  
pp. 7755-7757 ◽  
Author(s):  
Jong-Young Lee ◽  
Kristin E. Su ◽  
Edwin P. Chan ◽  
Qingling Zhang ◽  
Todd Emrick ◽  
...  
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Polymer Thin Films ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

scholarly journals EFFECTS OF c-AXIS HOPPING IN THE INTERLAYER TUNNELING MODEL OF HIGH-Tc LAYERED CUPRATES

1999 ◽  
Vol 13 (13) ◽  
pp. 1619-1632
Author(s):  
BIPLAB CHATTOPADHYAY ◽  
A. N. DAS
Keyword(s):  
Experimental Data ◽  
Transition Temperature ◽  
Cuprate Superconductors ◽  
Interlayer Coupling ◽  
Superconducting Gap ◽  
Tunneling Model ◽  
High Tc ◽  
Optimal Doping ◽  
Pair Tunneling ◽  
Layered Cuprates

We consider the interlayer pair-tunneling model for layered cuprates, including an effective single particle hopping along the c-axis. A phenomenological suppression of the c-axis hopping matrix element, by the pseudogap in cuprate superconductors, is incorporated. At optimal doping, quantities characteristic to the superconducting state, such as the transition temperature and the superconducting gap are calculated. Results from our calculations are consistent with the experimental observations with the noteworthy point that, the superconducting gap as a function of temperature shows excellent match to the experimental data. Predictions within the model, regarding T c variation with interlayer coupling, are natural outcomes which could be tested further.

Variations in the glass transition temperature of polyester with special architectures confined in thin films

Polymer ◽  
2010 ◽  
Vol 51 (1) ◽  
pp. 129-135 ◽  
Author(s):  
M. Erber ◽  
A. Khalyavina ◽  
K.-J. Eichhorn ◽  
B.I. Voit
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature
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