The symmetry of the rhombohedral phase of KIO₃

Abstract

AuszugEs wird über ein Frequenzübersetzungs-Experiment am Kaliumjodat in der rhomboedrischen Phase berichtet. Das Ergebnis des Experiments zeigt, zusammen mit einem früheren pyroelektrischen Versuch, daß rhomboedrisches KJO3 kein Inversionszentrum besitzt, also die Raumgruppe RZm hat und nicht die neuerdings angegebene zentrosymmetrische Raumgruppe R^m. AbstractAn experiment (second harmonie generation) on potassium iodate in the rhombohedral phase is reported. This result, plus a previously reported experiment (pyroelectricity), shows that rhombohedral KIÜ3 is acentric, R3m instead of the recently reported centrosymmetric ÄSTO.

Rashba spin splitting and anomalous spin textures in the bulk ferroelectric oxide perovskite KIO3

“…22 A thermodynamically favorable rhombohedral R3c phase was also theoretically predicted. 21,23,24 In both phases, the distortion of the octahedra centered at the I-atom induces spontaneous FE polarization. Furthermore, the presence of a heavy element (I), contributing to significant spin-orbit coupling (SOC) and inversion asymmetric nature may induce interesting Rashba-and Dresselhaus-type band splitting.…”

Rashba dominated spin-splitting in the bulk ferroelectric oxide perovskite KIO3

“…KIO, in particular, is experimentally synthesized at high temperature in non-centrosymmetric rhombohedral phase with R3m space group symmetry [16]. A dynamically favorable rhombohedral R3c phase is also theoretically predicted [15,17,18]. In both phases, distortion of octahedra centered at I-atom induces spontaneous FE polarization.…”