Orientational ordering: Computer studies of the quadrupolar "glass"

1983 ◽  
Vol 28 (9) ◽  
pp. 5199-5209 ◽  
Author(s):  
M. A. Klenin
Keyword(s):  
Orientational Ordering ◽  
Computer Studies ◽  
Quadrupolar Glass

Orientational ordering in solid ortho–para H2 mixtures and analogy with a spin glass

1985 ◽  
Vol 63 (1) ◽  
pp. 3-23 ◽  
Author(s):  
A. Brooks Harris ◽  
Horst Meyer
Keyword(s):  
Phase Transition ◽  
Spin Glass ◽  
Electric Quadrupole ◽  
Experimental Investigations ◽  
Cubic Phase ◽  
Hexagonal Close Packed ◽  
Quadrupole Interactions ◽  
Orientational Ordering ◽  
Low Pressures ◽  
Quadrupolar Glass

A review is presented of our understanding of the orientational ordering in solid hydrogen, where ortho-H2 molecules are subject to anisotropic electric quadrupole–quadrupole interactions. This review pertains to solid H2 at low pressures and is concerned mostly with NMR experiments. After a discussion of the phase transition from the disordered hexagonal close-packed (hep) to the long-range ordered cubic phase, a description is given of experimental investigations of the ordering in the hep phase for ortho concentrations X < 0.53. This ordering appears to take place continuously as the temperature decreases. The question as to whether or not this phase is to be called a quadrupolar glass phase is addressed, and comparison is made with the orientational freezing in other compounds. A theoretical analysis is given to show that the ortho–para mixture is the analog of a spin glass in a random field for which no phase transition is expected.

Orientational ordering in methane condensates in mesoporous SiO2modifications at low temperatures

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-137-Pr7-141 ◽  
Author(s):  
B. Asmussen ◽  
D. Balszunat ◽  
C. Gutt ◽  
W. Press ◽  
W. Langel ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Orientational Ordering

Orientational ordering in solid hydrogen

1976 ◽  
Vol 37 (7-8) ◽  
pp. 981-989 ◽  
Author(s):  
N.S. Sullivan
Keyword(s):  
Solid Hydrogen ◽  
Orientational Ordering
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