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The influence of the O–O isotope substitution on spin dynamics of (La0.25Pr0.75)0.7Ca0.3MnO3: La NMR data |
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| Authors: | K Mikhalev A Pogudin A Yakubovskii O Gorbenko A Kaul K Kumagai Y Furukawa |
| Institution: | 1. Ural Division of RAS, Institute of Metal Physics, Ekaterinburg 620219, Russia;2. Russian Research Centre “Kurchatov Institute”, Moscow 123182, Russia;3. Moscow State University, Moscow 119899, Russia;4. Hokkaido University, Sapporo 060-0810, Japan |
| Abstract: | The 139La NMR spectra and spin–spin relaxation times have been measured for the 16O and 18O isotope-substituted manganite (La0.25Pr0.75)0.7Ca0.3MnO3 in the external magnetic field of 5 T. The NMR signal wipe-out has been observed in the 18O-enriched sample in the charge-ordered state. This phenomenon is connected with a sharp increase in the spin–spin relaxation rate. The great isotope-effect observed provides a clear evidence of an essential role of oxygen motion in controlling the long-range magnetic order in manganites. |
| Keywords: | 75 47 Gk 75 25 +z 76 60 Jx |
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