Multiple quadrupolar spin echoes in the La-filled skutterudite LaOs4As12 |
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| Institution: | 1. Bundesanstalt für Materialforschung und –prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany;2. Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), Unter den Linden 6, 10099 Berlin, Germany;3. Leibniz-Institut für Analytische Wissenschaften - ISAS - e. V., Department Berlin, Schwarzschildstr. 8, 12489 Berlin, Germany;4. Chevron Energy Technology Company, 100 Chevron Way, Richmond, CA 94801, United States;5. Spetec GmbH, Berghamer Str. 2, 85435 Erding, Germany |
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| Abstract: | 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)τ, (3/2)τ, (5/3)τ, 2τ, (5/2)τ, 3τ, 4τ. 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. |
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