Tensor order parameters for magnetic-structural phase transitions in crystals with strong spin-lattice coupling

1980 ◽  
Vol 21 (3) ◽  
pp. 1089-1101 ◽  
Author(s):  
Joseph Birman ◽  
Yuri Izyumov
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Order Parameters ◽  
Structural Phase Transitions ◽  
Spin Lattice ◽  
Tensor Order ◽  
Lattice Coupling ◽  
Strong Spin

scholarly journals Intriguing spin–lattice interactions in EuTiO3

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Annette Bussmann-Holder ◽  
Efthymios Liarokapis ◽  
Krystian Roleder
Keyword(s):  
Nearest Neighbor ◽  
Structural Phase ◽  
Structural Instability ◽  
Perovskite Oxide ◽  
Tetragonal Symmetry ◽  
Spin Interaction ◽  
Spin Lattice ◽  
Research Activities ◽  
Lattice Coupling ◽  
Strong Spin

AbstractDuring the last decade the cubic perovskite oxide EuTiO3 (ETO) has attracted enormous novel research activities due to possible multiferroicity, hidden magnetism far above its Néel temperature at TN = 5.5 K, structural instability at TS = 282 K, possible application as magneto-electric optic device, and strong spin–lattice coupling. Here we address a novel highlight of this compound by showing that well below TS a further structural phase transition occurs below 210 K without the application of an external magnetic field, and by questioning the assumed tetragonal symmetry of the structure below TS where tiny deviations from true tetragonality are observed by birefringence and XRD measurements. It is suggested that the competition in the second nearest neighbor spin–spin interaction modulated by the lattice dynamics is at the origin of these new observations.

Successive Phase Transitions in Potassium Hexachloroselenate(IV) Revealed by 35Cl NQR

1996 ◽  
Vol 51 (5-6) ◽  
pp. 705-709 ◽  
Author(s):  
Tetsuo Asaji ◽  
Masaki Ohkawa ◽  
Takehiko Chiba ◽  
Makoto Kaga
Keyword(s):  
Phase Transitions ◽  
Temperature Dependence ◽  
Structural Phase ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Structural Phase Transitions ◽  
Spin Lattice ◽  
35Cl Nqr ◽  
Successive Phase

Abstract K2SeCl6 undergoes structural phase transitions of first order at 35 K, 65 K, and 79 K. The temperature dependence of the 35Cl NQR spin-lattice relaxation time suggests that the phase transitions at 65 K and 79 K are displacive ones associated with a resonant soft mode. The presence of a precursor cluster is suggested by the temperature dependence of the signal intensity above 79 K.

Phonons and magnons under the sequential structural phase transitions in La2NiO4

1991 ◽  
Vol 185-189 ◽  
pp. 895-896 ◽  
Author(s):  
S. Sugai ◽  
S. Hosoya ◽  
T. Kajitani ◽  
T. Fukuda ◽  
S. Onodera
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions
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