scholarly journals Ferroelectric metallomesogens composed of achiral spin crossover molecules

2019 ◽  
Vol 10 (22) ◽  
pp. 5843-5848 ◽  
Author(s):  
Ryohei Akiyoshi ◽  
Yuma Hirota ◽  
Daisuke Kosumi ◽  
Mayu Tsutsumi ◽  
Masaaki Nakamura ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Spin Crossover ◽  
Spin Transition ◽  
Crystal Phase ◽  
Liquid Crystal Phase ◽  
Crystal Phase Transition ◽  
Liquid Crystal Phase Transition ◽  
First Time

We report for the first time ferroelectricity induced by spin transition associated with a crystal – liquid crystal phase transition in achiral spin crossover molecules.

Evidence for a liquid crystal phase transition in two-dimensional electrons in high Landau levels

2002 ◽  
Vol 12 (9) ◽  
pp. 377-380
Author(s):  
K. B. Cooper ◽  
M. P. Lilly ◽  
J. P. Eisenstein ◽  
L. N. Pfeiffer ◽  
K. W. West
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Landau Levels ◽  
Crystal Phase ◽  
Two Dimensional ◽  
Liquid Crystal Phase ◽  
Stripe Phase ◽  
Stripe Order ◽  
Crystal Phase Transition ◽  
Liquid Crystal Phase Transition

Transport measurements of high-mohility two-dimensional electron systems at low temperatures have revealed a large resistance anisotropy around half-filling of excited Landau levels. These results have been attributed to electronic stripe-phase formation with spontaneously broken orientational symmetry. Mechanisms which are known to break the orientational symmetry include poorly-understood crystal structure effects and an in-plane magnetic field, $B_{||}$. Here we report that a large $B_{||}$ also causes the transport anisotropy to persist up to much higher temperatures. In this regime, we find that the anisotropic resistance scales sublinearly with $B_{||}/T$. These observations support the proposal that the transition from anisotropic to isotropic transport reflects a liquid crystal phase transition where local stripe order persists even in the isotropic regime.

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