Nematic order parameter as determined from dielectric relaxation data and other methods

2003 ◽  
Vol 5 (5) ◽  
pp. 924-928 ◽  
Author(s):  
Stanisław Urban ◽  
Bo Gestblom ◽  
Wojciech Kuczyński ◽  
Sebastian Pawlus ◽  
Albert Würflinger
Keyword(s):  
Dielectric Relaxation ◽  
Order Parameter ◽  
Relaxation Data ◽  
Nematic Order

On the derivation of the nematic order parameter from the dielectric relaxation times

1999 ◽  
Vol 1 (11) ◽  
pp. 2787-2791 ◽  
Author(s):  
Stanisław Urban ◽  
Albert Würflinger ◽  
Bo Gestblom
Keyword(s):  
Dielectric Relaxation ◽  
Order Parameter ◽  
Relaxation Times ◽  
Nematic Order

Dielectric relaxation of some aliphatic ketones in dilute solutions

1976 ◽  
Vol 54 (7) ◽  
pp. 794-799 ◽  
Author(s):  
M. P. Madan
Keyword(s):  
Free Energy ◽  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Relaxation Mechanism ◽  
Relaxation Data ◽  
Nonpolar Solvents ◽  
Aliphatic Ketones ◽  
Entropy Of Activation ◽  
Enthalpy And Entropy ◽  
Dielectric Relaxation Behavior

The dielectric relaxation behavior of 2-butanone, 2-pentanone, 2-heptanone, and 3-nonanone in dilute nonpolar solvents, n-heptane, cyclohexane, benzene, and carbon tetrachloride has been studied in the microwave region at a number of temperatures. The relaxation data have been used to estimate the free energy, enthalpy, and entropy of activation for the relaxation mechanism. The values of the relaxation time for those solutions for which there are available known data agree well with other determinations. The results have been discussed in terms of dipole reorientation by intramolecular and overall molecular rotation and compared, wherever possible, with other similar studies on aliphatic molecules.

scholarly journals Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors

2019 ◽  
Vol 123 (6) ◽  
Author(s):  
H. Pfau ◽  
S. D. Chen ◽  
M. Yi ◽  
M. Hashimoto ◽  
C. R. Rotundu ◽  
...  
Keyword(s):  
Order Parameter ◽  
Momentum Dependence ◽  
Iron Based Superconductors ◽  
Nematic Order ◽  
Iron Based

The Physical and Molecular Properties of New Low Melting Nematics with Negative Dielectric Anisotropy

1999 ◽  
Vol 54 (6-7) ◽  
pp. 448-452 ◽  
Author(s):  
R. Dąbrowski ◽  
J. Jadżyna ◽  
J. Dziaduszek ◽  
Z. Stolarz ◽  
G. Czechowski ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Physical Properties ◽  
Temperature Dependence ◽  
Carboxylic Acids ◽  
Order Parameter ◽  
Room Temperature ◽  
Dielectric Anisotropy ◽  
Molecular Dipole ◽  
Nematic Order ◽  
Moment Vector

Abstract The paper presents some basic physical properties (static electric permittivities, refraction indices, density and viscosity) of 2-chloro-4-n’-alkylphenyl esters of 4-n-alkylbicyclo[2,2,2] octane-1-carboxylic acids (n’=7, n = 5 and 7) which are, at room temperature, nematics with a negative dielectric an-isotropy. On the basis of temperature dependence of the principal static permittivities ε‖(T) and e⊥(T) of the nematics, using the Maier-Meier equations, the angle between the dipole moment vector and the long axis of mesogenic molecules, the apparent molecular dipole moment square pl μ2app(T), and the nematic order parameter S(T) were determined.

scholarly journals Intertwined Vestigial Order in Quantum Materials: Nematicity and Beyond

2019 ◽  
Vol 10 (1) ◽  
pp. 133-154 ◽  
Author(s):  
Rafael M. Fernandes ◽  
Peter P. Orth ◽  
Jörg Schmalian
Keyword(s):  
Order Parameter ◽  
Cuprate Superconductors ◽  
Primary Phase ◽  
Nematic Order ◽  
Unconventional Superconductors ◽  
Underlying Principle ◽  
Microscopic Models ◽  
Quantum Materials ◽  
Component Order

A hallmark of the phase diagrams of quantum materials is the existence of multiple electronic ordered states, which, in many cases, are not independent competing phases, but instead display a complex intertwinement. In this review, we focus on a particular realization of intertwined orders: a primary phase characterized by a multi-component order parameter and a fluctuation-driven vestigial phase characterized by a composite order parameter. This concept has been widely employed to elucidate nematicity in iron-based and cuprate superconductors. Here we present a group-theoretical framework that extends this notion to a variety of phases, providing a classification of vestigial orders of unconventional superconductors and density waves. Electronic states with scalar and vector chiral order, spin-nematic order, Ising-nematic order, time-reversal symmetry-breaking order, and algebraic vestigial order emerge from one underlying principle. The formalism provides a framework to understand the complexity of quantum materials based on symmetry, largely without resorting to microscopic models.

Domains In Nematic Elastomers

1993 ◽  
Vol 328 ◽  
Author(s):  
A. Ten Bosch ◽  
L. Varichon
Keyword(s):  
Liquid Crystal ◽  
Mechanical Stress ◽  
Stress Tensor ◽  
Elastic Deformation ◽  
Order Parameter ◽  
Side Chain ◽  
Elastic Model ◽  
Liquid Crystal Elastomer ◽  
Nematic Order ◽  
Nematic Elastomers

ABSTRACTA theory based on an elastic model and including coupling between elastic deformation and nematic order parameter as well as an interaction between crosslinks and orientation is given. The nematic order parameter and the stress tensor have been determined on elongation and as a function of temperature as well as he anisotropy of the conformation of a side chain liquid crystal elastomer on application of a mechanical stress. A transition from a turbid, low ordered polydomain phase to a transparent, Monodomain is shown to occur.

The order parameter model of liquids and glasses with applications to dielectric relaxation

1980 ◽  
Vol 73 (4) ◽  
pp. 1932-1939 ◽  
Author(s):  
Arnold V. Lesikar ◽  
Cornelius T. Moynihan
Keyword(s):  
Dielectric Relaxation ◽  
Order Parameter
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