U. Höchli, L.A. Boatner
Physical Review B
Ultrasonic velocity and attenuation data are presented at T < 1 K for pure KTaO3 and for KTaO3 where X = Na and Li. Evidence is obtained for coherent tunnelling of Na ions within a correlation volume containing many impurities through barriers with distributed height and asymmetry parameters. Tunnelling is correlated with dipole-glass formation. No evidence of tunnelling is found in KTaO3 and KTaO3
U. Höchli, L.A. Boatner
Physical Review B
G. Lanzi, P. Milani, et al.
Physical Review B
G. Banfi, E. Giulotto, et al.
EPL
U. Höchli, K.A. Müller, et al.
Physics Letters