scholarly journals Electric quadrupole interactions and the - phase transition in Ce: the role of conduction electrons

2000 ◽  
Vol 17 (1) ◽  
pp. 15-32 ◽  
Author(s):  
A.V. Nikolaev ◽  
K.H. Michel
Keyword(s):  
Phase Transition ◽  
Electric Quadrupole ◽  
Conduction Electrons ◽  
Quadrupole Interactions

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.

scholarly journals Role of charged gauge fields in generating magnetic seed fields in bubble collisions during the cosmological electroweak phase transition

2008 ◽  
Vol 77 (2) ◽  
Author(s):  
Trevor Stevens ◽  
Mikkel B. Johnson ◽  
Leonard S. Kisslinger ◽  
Ernest M. Henley ◽  
W.-Y Pauchy Hwang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Gauge Fields ◽  
Electroweak Phase Transition

The role of π-bonding on the high temperature structure of the double perovskites Ba2CaUO6and BaSrCaUO6

2015 ◽  
Vol 44 (36) ◽  
pp. 16036-16044 ◽  
Author(s):  
Emily Reynolds ◽  
Gordon J. Thorogood ◽  
Maxim Avdeev ◽  
Helen E. A. Brand ◽  
Qinfen Gu ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Temperature Structure ◽  
Double Perovskites ◽  
Phase Transition Behavior ◽  
X Ray ◽  
Progressive Loss ◽  
Octahedral Tilting

High temperature synchrotron X-ray and neutron diffraction powder diffraction studies of the uranium perovskites Ba2CaUO6and BaSrCaUO6reveal unusual phase transition behavior associated with the progressive loss of cooperative octahedral tilting.

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