Phase transition temperature and paramagnetic effect in Al1−xCrxK(SO4)2·12H2O (x = 0, 0.07, and 0.2) crystals studied by 27Al nuclear magnetic resonance relaxation time

2013 ◽  
Vol 113 (17) ◽  
pp. 17E105 ◽  
Author(s):  
Celesta L. Chang ◽  
Se-Young Jeong ◽  
Younkee Paik
Keyword(s):  
Phase Transition ◽  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Transition Temperature ◽  
Magnetic Resonance ◽  
Phase Transition Temperature ◽  
Nuclear Magnetic Resonance Relaxation ◽  
Paramagnetic Effect ◽  
27Al Nuclear Magnetic Resonance ◽  
Resonance Relaxation

Ordering of the O(2)…D… O(2) bonds near the phase transition in KD3(SeO3)2 single crystals by D nuclear magnetic resonance

Open Physics ◽  
2013 ◽  
Vol 11 (1) ◽  
Author(s):  
Ae Lim ◽  
Se-Young Jeong
Keyword(s):  
Phase Transition ◽  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Transition Temperature ◽  
Magnetic Resonance ◽  
Single Crystals ◽  
Phase Transition Temperature ◽  
Experimental Results ◽  
Abrupt Decrease ◽  
Slowing Down

AbstractDeuterium resonance investigations of KD3(SeO3)2 single crystals have been performed near the phase transition temperature T C. There are two types of deuterium bonds in these crystals with different behaviors at this phase transition. Our experimental results show that there are significant changes in the D spinlattice relaxation time T 1 at T C; the abrupt decrease in T 1 near T C can be explained by the critical slowing down of an overdamped soft pseudospin-type deuteron mode. Further, the ordering of the O(2)…D… O(2) bonds is affected by the phase transition, whereas the ordering of the O(1)-D… O(3) bonds is unaffected. The D NMR measurements also show that the D(2) deuteron disordering above T C is dynamic and not static.

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