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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Complex phase diagram of Ce0.75La0.25B6 studied by muon spin rotation and relaxation in zero and nonzero external fields
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Complex phase diagram of Ce0.75La0.25B6 studied by muon spin rotation and relaxation in zero and nonzero external fields

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The static and dynamic behavior of the local magnetic fields across the phase diagram and at the phase transitions of Ce0.75La0.25B6 was investigated. Different routes in the phase diagram were followed, either by varying the temperature T at constant applied fields B-ext or varying the field at fixed T. It was found that a well-established long-range magnetic order in phase III, characterizing parent CeB6, is absent here and is replaced by a short-range order (SRO) or more or less random order. This "order" persists in phase IV but, in zero field, with rising temperature in a decreasing volume fraction approaching zero at the IV-I transition. Such "phase separation" is not seen in the presence of an applied field (greater than or similar to 0.3 T). The observed SRO in phase IV is consistent with the mesoscopic SRO dipolar magnetism put forward on the basis of recent resonant x-ray scattering data. On varying T at fixed B-ext, both the transitions IV-I and II-III appear as a cusp in the spin-lattice relaxation rate lambda. The mu(+) Knight shift appears insensitive to the various phase transitions, in particular to the I-II transition, in sharp contrast to the case in CeB6.

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