Spin-lattice relaxation-rate anomaly at structural phase transitions

1997 ◽  
Vol 56 (21) ◽  
pp. 13785-13795 ◽  
Author(s):  
A. P. Levanyuk ◽  
S. A. Minyukov ◽  
J. Etrillard ◽  
B. Toudic
Keyword(s):  
Phase Transitions ◽  
Relaxation Rate ◽  
Structural Phase ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Structural Phase Transitions ◽  
Spin Lattice Relaxation Rate ◽  
Spin Lattice ◽  
Lattice Relaxation Rate

NQR-NMR and Raman Study of a Structural Phase Transitionin (NH4)2PbCl6

1989 ◽  
Vol 44 (2) ◽  
pp. 109-116 ◽  
Author(s):  
C. Dimitropoulos ◽  
J. Pelzl
Keyword(s):  
Relaxation Rate ◽  
Structural Phase ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Threefold Axis ◽  
Spin Lattice Relaxation Rate ◽  
Spin Lattice ◽  
H Nmr ◽  
Lattice Relaxation Rate ◽  
Angle Rotation

Abstract The temperature dependence of the chlorine NQR frequency and spin-lattice relaxation rate indicate a structural phase transformation in (NH4)2PbCl6 at 80 K similar to that observed in (NH4)2TeCl6 at 85 K. Both transitions are characterized by a discontinuity of the temperature derivative of the NQR frequency shift and by a cusp in the NQR spin-lattice relaxation rate, but no splitting of the NQR line is observed below Tc. These observations point towards a transition that leaves the chlorine sites equivalent, such as a small angle rotation of the MXg2-6octahedra about their threefold axis. Supplementary 1H-NMR measurements have been performed to investigate the direct influence of NH4+ motion on the Cl-NQR. The phase transitions in mixed (NH4: K)2PbCl6 crystals have also been studied.

scholarly journals Pseudogap Behavior of the Nuclear Spin–Lattice Relaxation Rate in FeSe Probed by 77Se-NMR

2018 ◽  
Vol 87 (1) ◽  
pp. 013704 ◽  
Author(s):  
Anlu Shi ◽  
Takeshi Arai ◽  
Shunsaku Kitagawa ◽  
Takayoshi Yamanaka ◽  
Kenji Ishida ◽  
...  
Keyword(s):  
Relaxation Rate ◽  
Nuclear Spin ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice Relaxation Rate ◽  
Spin Lattice ◽  
Lattice Relaxation Rate ◽  
Nuclear Spin Lattice Relaxation
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