Enhancement of the superconducting order parameter in the compound Dy0.8Y0.2Rh4B4 at the phase transition of its magnetic subsystem from the antiferromagnetic to the ferrimagnetic state

2009 ◽  
Vol 35 (5) ◽  
pp. 424-425 ◽  
Author(s):  
V. M. Dmitriev ◽  
A. Zaleski ◽  
E. P. Khlybov ◽  
L. F. Rybaltchenko ◽  
E. V. Khristenko ◽  
...  
Keyword(s):  
Phase Transition ◽  
Order Parameter ◽  
Superconducting Order Parameter ◽  
Magnetic Subsystem

The flattening phase transition in systems of trapped ions

2009 ◽  
Vol 87 (10) ◽  
pp. 1425-1435 ◽  
Author(s):  
Taunia L. L. Closson ◽  
Marc R. Roussel
Keyword(s):  
Phase Transition ◽  
Critical Exponent ◽  
Order Parameter ◽  
Ion Trap ◽  
Anisotropy Parameter ◽  
Critical Value ◽  
Trapped Ions ◽  
Dimensional Structure ◽  
Flattening Process ◽  
Second Order Phase Transition

When the anisotropy of a harmonic ion trap is increased, the ions eventually collapse into a two-dimensional structure consisting of concentric shells of ions. This collapse generally behaves like a second-order phase transition. A graph of the critical value of the anisotropy parameter vs. the number of ions displays substructure closely related to the inner-shell configurations of the clusters. The critical exponent for the order parameter of this phase transition (maximum extent in the z direction) was found computationally to have the value β = 1/2. A second critical exponent related to displacements perpendicular to the z axis was found to have the value δ = 1. Using these estimates of the critical exponents, we derive an equation that relates the amplitudes of the displacements of the ions parallel to the x–y plane to the amplitudes along the z axis during the flattening process.

Phase transition, order parameter, and their manifestation in optical spectra of Hg2Cl2

2012 ◽  
Vol 54 (6) ◽  
pp. 1212-1219
Author(s):  
Yu. F. Markov ◽  
E. M. Roginskii ◽  
A. S. Yurkov
Keyword(s):  
Phase Transition ◽  
Order Parameter ◽  
Optical Spectra
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