scholarly journals Magnetic Field-Induced Phase Transition in the Quasi Two-Dimensional Organic Superconductor (BEDO-TTF)2ReO4 .H2O

1997 ◽  
Vol 7 (4) ◽  
pp. 599-610 ◽  
Author(s):  
A. Audouard ◽  
V. N. Laukhin ◽  
C. Proust ◽  
L. Brossard ◽  
N. D. Kushch
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Organic Superconductor ◽  
Two Dimensional

Phase Transition in 2D Anisotropic Ising Model with Next-Nearest Neighbor Interactions in a Magnetic Field

SPIN ◽  
2018 ◽  
Vol 08 (03) ◽  
pp. 1850010
Author(s):  
D. Farsal ◽  
M. Badia ◽  
M. Bennai
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Phase Diagram ◽  
Monte Carlo ◽  
Magnetic Susceptibility ◽  
Critical Temperature ◽  
Ising Model ◽  
Nearest Neighbor ◽  
Two Dimensional ◽  
The Magnetic Field

The critical behavior at the phase transition of the ferromagnetic two-dimensional anisotropic Ising model with next-nearest neighbor (NNN) couplings in the presence of the field is determined using mainly Monte Carlo (MC) method. This method is used to investigate the phase diagram of the model and to verify the existence of a divergence at null temperature which often appears in two-dimensional systems. We analyze also the influence of the report of the NNN interactions [Formula: see text] and the magnetic field [Formula: see text] on the critical temperature of the system, and we show that the critical temperature depends on the magnetic field for positive values of the interaction. Finally, we have investigated other thermodynamical qualities such as the magnetic susceptibility [Formula: see text]. It has been shown that their thermal behavior depends qualitatively and quantitatively on the strength of NNN interactions and the magnetic field.

LOCAL MINIMIZERS FOR THE GINZBURG–LANDAU ENERGY NEAR CRITICAL MAGNETIC FIELD: PART I

1999 ◽  
Vol 01 (02) ◽  
pp. 213-254 ◽  
Author(s):  
SYLVIA SERFATY
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Critical Value ◽  
Critical Magnetic Field ◽  
Two Dimensional ◽  
Local Minimizers ◽  
Large Parameter ◽  
Ginzburg Landau

We find local minimizers of the two-dimensional Ginzburg–Landau functionals depending on a large parameter κ, which describe the behavior of a superconductor in a prescribed exterior magnetic field hex. We prove an estimate on the critical value Hc1 of hex(κ), corresponding to the first phase-transition in which vortices appear in the superconductor; and we locate these vortices.

Transport Properties of Normal and Quasinormal States of Poor Superconductors

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3151-3156 ◽  
Author(s):  
Vsevolod Gantmakher
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Low Temperature ◽  
Single Crystals ◽  
Quantum Phase Transition ◽  
Normal State ◽  
Cooper Pairs ◽  
Two Dimensional ◽  
Field State ◽  
The Magnetic Field

There are some doubts whether materials near the superconductor–insulator transition (SIT), either on the insulating side, or with superconductivity suppressed by the magnetic field, behave like an ordinary metal. Two experiments in which this issue is addressed will be reviewed here, namely, transport measurements of two different materials: single crystals YBa2Cu3O 6+x (x ≈ 0.37) — a representative of the HTS family and amorphous InO x where x is the oxygen content which could be changed through moderate-temperature annealing. The low-temperature normal resistivity ρ(T) of YBaCuO crystals on both sides of SIT behaves as usual "bad" metal with conductivity below the Mott's minimum value. The amorphous In-O films behave differently. Those films with superconductivity do not display any characteristic magnetic field which can be interpreted as Bc2. Instead, they give out an example of a quantum phase transition and follow Fisher's model1 for "the field-tuned SIT in disordered two-dimensional superconductors" though they are not precisely two-dimensional and their high-magnetic-field state may not be insulating at all. Apparently, the normal state of InO x films comprises localized Cooper pairs.

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