Low-energy magnetic excitations in Rh-substituted CeRu2Al10
An intriguing phase transition has been observed at T0 = 27.3K in the Kondo-insulator compound CeRu2Al10. Whereas long-range magnetic order exists below T0, there is strong evidence that the transition cannot be explained in terms of standard AF exchange interactions alone. Further insight into this physics can be seeked by varying the number of d electrons on the transition-metal sites. Bulk magnetic measurements have shown that a low concentration of Rh substituted for Ru restores a more conventional magnetic behavior. The effect on the excitation spectrum must now be characterized. Single crystals have been produced, and experiments performed on the thermal-beam triple-axis spectrometers 2T and IN8. However, the results remain inconclusive because the signal is much weaker than in pure CeRu2Al10, despite the factor of two larger AF ordered moment, and the excitation branch tentatively identified on 2T could not be confirmed on IN8. The higher resolution and high flux of Thales (optionally IN12) should provide better measuring conditions for observing the magnetic response at low energy. The results will serve to test the RPA calculations applied previously to CeRu2Al10
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ROBERT Julien; D.T. Adroja; ALEKSEEV Pavel A; MIGNOT Jean Michel; PETIT Sylvain and STEFFENS Paul. (2015). Low-energy magnetic excitations in Rh-substituted CeRu2Al10. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1458
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