Microscopic calculation of dynamical correlations in two‐dimensional quantum antiferromagnets at low temperature (abstract)

1990 ◽  
Vol 67 (9) ◽  
pp. 5761-5761
Author(s):  
T. Becher ◽  
G. Reiter
Keyword(s):  
Low Temperature ◽  
Two Dimensional ◽  
Microscopic Calculation ◽  
Quantum Antiferromagnets

LOW TEMPERATURE ACTION FOR QUANTUM ANTIFERROMAGNETS ON A TRIANGULAR LATTICE

1990 ◽  
Vol 04 (04) ◽  
pp. 569-580 ◽  
Author(s):  
ANTIMO ANGELUCCI
Keyword(s):  
Low Temperature ◽  
Configuration Space ◽  
Triangular Lattice ◽  
Ground State ◽  
Two Dimensional ◽  
Heisenberg Antiferromagnet ◽  
Low Frequencies ◽  
Quantum Antiferromagnets ◽  
Temperature Action

We present the long-wavelengths/low-frequencies action of a two-dimensional quantum Heisenberg antiferromagnet of general spin magnitude s on a triangular lattice which describe the fluctuations around the ordered Neél ground state. This action is a nonlinear σ-model whose configuration space is the SO(3) manifold, in this respect being different from the usual S2 σ-model which models an antiferromagnet on a bipartite lattice. We present a map on a O(4)-model which allows to study the properties of the system.

Low-temperature behavior of two-dimensional quantum antiferromagnets

1988 ◽  
Vol 60 (11) ◽  
pp. 1057-1060 ◽  
Author(s):  
Sudip Chakravarty ◽  
Bertrand I. Halperin ◽  
David R. Nelson
Keyword(s):  
Low Temperature ◽  
Temperature Behavior ◽  
Two Dimensional ◽  
Quantum Antiferromagnets

Low-temperature properties of two-dimensional frustrated quantum antiferromagnets

1992 ◽  
Vol 68 (11) ◽  
pp. 1762-1765 ◽  
Author(s):  
P. Azaria ◽  
B. Delamotte ◽  
D. Mouhanna
Keyword(s):  
Low Temperature ◽  
Two Dimensional ◽  
Quantum Antiferromagnets

scholarly journals c-Perpendicular Orientation of Poly(ʟ-lactide) Films

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1572
Author(s):  
Baku Nagendra ◽  
Paola Rizzo ◽  
Christophe Daniel ◽  
Lucia Baldino ◽  
Gaetano Guerra
Keyword(s):  
Low Temperature ◽  
Film Plane ◽  
Wide Angle ◽  
Two Dimensional ◽  
X Ray Diffraction ◽  
Amorphous Films ◽  
High Transparency ◽  
X Ray ◽  
Crystalline Forms ◽  
Induced Crystallization

Poly(ʟ-lactide) (PLLA) films, even of high thickness, exhibiting co-crystalline and crystalline α phases with their chain axes preferentially perpendicular to the film plane (c⊥ orientation) have been obtained. This c⊥ orientation, unprecedented for PLLA films, can be achieved by the crystallization of amorphous films as induced by low-temperature sorption of molecules being suitable as guests of PLLA co-crystalline forms, such as N,N-dimethylformamide, cyclopentanone or 1,3-dioxolane. This kind of orientation is shown and quantified by two-dimensional wide-angle X-ray diffraction (2D-WAXD) patterns, as taken with the X-ray beam parallel to the film plane (EDGE patterns), which present all the hk0 arcs centered on the meridian. PLLA α-form films, as obtained by low-temperature guest-induced crystallization, also exhibit high transparency, being not far from those of the starting amorphous films.

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