scholarly journals Supersolidity of undercoordinated and hydrating water

2018 ◽  
Vol 20 (48) ◽  
pp. 30104-30119 ◽  
Author(s):  
Chang Q. Sun
Keyword(s):  
Phase Transition ◽  
Energy Level ◽  
Core Shell ◽  
Critical Temperatures ◽  
Supersolid Phase ◽  
Phonon Lifetime ◽  
No Man's Land ◽  
Electrostatic Polarization

Electrostatic polarization or molecular undercoordination endows the supersolidity by shortening and stiffening the H–O bond and lengthening and softening the O:H nonbond, deepening the O 1s energy level, and prolonging the photoelectron and phonon lifetime. The supersolid phase is less dense, viscoelastic, mechanically and thermally more stable, which offsets boundaries of structural phases and critical temperatures for phase transition of the coordination-resolved core–shell structured ice such as the ‘no man's land’ supercooling and superheating.

scholarly journals Nucleation is more than critical: A case study of the electroweak phase transition in the NMSSM

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Sebastian Baum ◽  
Marcela Carena ◽  
Nausheen R. Shah ◽  
Carlos E. M. Wagner ◽  
Yikun Wang
Keyword(s):  
Phase Transition ◽  
Parameter Space ◽  
Local Minima ◽  
Critical Temperatures ◽  
Electroweak Phase Transition ◽  
First Order ◽  
Vacuum Structure ◽  
The Universe ◽  
Scalar Sector

Abstract Electroweak baryogenesis is an attractive mechanism to generate the baryon asymmetry of the Universe via a strong first order electroweak phase transition. We compare the phase transition patterns suggested by the vacuum structure at the critical temperatures, at which local minima are degenerate, with those obtained from computing the probability for nucleation via tunneling through the barrier separating local minima. Heuristically, nucleation becomes difficult if the barrier between the local minima is too high, or if the distance (in field space) between the minima is too large. As an example of a model exhibiting such behavior, we study the Next-to-Minimal Supersymmetric Standard Model, whose scalar sector contains two SU(2) doublets and one gauge singlet. We find that the calculation of the nucleation probabilities prefers different regions of parameter space for a strong first order electroweak phase transition than the calculation based solely on the critical temperatures. Our results demonstrate that analyzing only the vacuum structure via the critical temperatures can provide a misleading picture of the phase transition patterns, and, in turn, of the parameter space suitable for electroweak baryogenesis.

A structural phase transition in NaTaOGeO4 and its relation to phase transitions in titanite

2007 ◽  
Vol 63 (4) ◽  
pp. 545-550 ◽  
Author(s):  
Thomas Malcherek
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Transition Metal ◽  
Structural Phase Transition ◽  
Order Parameter ◽  
Diffuse Scattering ◽  
Structural Phase ◽  
Group Symmetry ◽  
Critical Temperatures ◽  
Symmetry Properties

A structural phase transition from space-group symmetry P21/c to C2/c is reported for NaTaOGeO4 (NTGO). The critical temperature has been located at T c = 116 K, based on the appearance of sharp diffraction maxima at positions h + k = 2n + 1 of reciprocal space on cooling below this temperature. Strongly anisotropic diffuse scattering in sheets normal to [001] is observable for T > T c and persists up to ambient temperature. Similarities to phase transitions observed in other compounds of the titanite structure type are discussed. The symmetry properties of these phase transitions are reassessed on the basis of the structural data available. The primary order parameter is identified with the displacement of the transition metal cation M (M = Ta in NTGO) away from the centre of symmetry that it nominally occupies in the paraphase. The order parameter transforms as the Y_{2}^{-} representation. The anisotropic diffuse scattering is attributed to the one-dimensional correlation of local M displacements parallel to the direction of chains of trans-corner-sharing MO6 octahedra. The critical temperatures of the isomorphous phase transitions in various titanite-type compounds depend linearly on the squared transition-metal displacement measured in the ordered P21/c phase.

The Shape Analysis at One End of the Flux Tube with Dynamical Quarks

2020 ◽  
pp. 10-14
Author(s):  
Battogtokh Purev ◽  
Sodbileg Chagdaa ◽  
Enkhtuya Galsandorj
Keyword(s):  
Phase Transition ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Shape Analysis ◽  
Flux Tube ◽  
Critical Temperatures ◽  
Transverse Profile ◽  
Deconfinement Phase Transition ◽  
The One

 In the deconfinement phase transition, we have analyzed the shape of the one end of the flux tube computed by HISQ configurations in full QCD with (2+1) flavors. The ratio of the longitudinal and transverse profile of the parallel chrome-electric field strength  revealed that the transverse profile becomes wider than the longitudinal profile when the temperature increases. Also, we found that the comparison, as a function of the distance between two quarks, likely shows melting distances of the flux tube. The melting distances are different for each temperature. They are R = 1.5 fm at T/Tc = 0.97 and R = 1.2 fm at above the critical temperatures T/Tc = 1.00, 1.03, 1.06 and 1.09.

Enhanced L10 phase transition in CoPt/Ag core/shell nanoparticles

2012 ◽  
Vol 86 ◽  
pp. 142-145 ◽  
Author(s):  
L.N. Yu ◽  
L.Y. Lu ◽  
Z.D. Xu ◽  
X.G. Xu ◽  
J. Miao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Density Fluctuations across the Superfluid-Supersolid Phase Transition in a Dipolar Quantum Gas

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. Hertkorn ◽  
J.-N. Schmidt ◽  
F. Böttcher ◽  
M. Guo ◽  
M. Schmidt ◽  
...  
Keyword(s):  
Phase Transition ◽  
Density Fluctuations ◽  
Quantum Gas ◽  
Supersolid Phase ◽  
Dipolar Quantum Gas
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