Multiple quadrupolar spin echoes in the La-filled skutterudite LaOs4As12.
We report experimental results of 139La pulse NMR studies in LaOs4As12. Measurements have been performed on a powder sample obtained from high quality single crystals. For the first time the pattern of quadrupole echoes for 139La nuclei (I=7/2) was obtained. All the allowed quadrupolar echoes expected for spin I=7/2 were observed at times t=(4/3)tau, (3/2)tau, (5/3)tau, 2tau, (5/2)tau, 3tau, 4tau. The presence of quadrupolar echoes is the fingerprint of the deviation from perfect cubic symmetry of the structure and can be used as a simple and fast test of the sample quality.
Nowak
B
B
Institute for Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland. B.Nowak@int.pan.wroc.pl
Zogał
O
O
Henkie
Z
Z
Maple
M B
MB