Dispersion of low-energy resonant spin excitations in CeB6
Among the RB6 family of hexaborides (R being a rare earth), CeB6 stands out as the only compound that exhibits an exotic ordered phase in the narrow temperature range between TN = 2.3 K and TQ = 3.2 K, commonly referred to as the antiferroquadrupolar (AFQ) phase or “phase II”. Its true nature is not yet fully understood and is discussed controversially. In our recent experiments performed at IN14, we have discovered a strong magnetic “exciton” mode at the AFQ wavevector R(1/2,1/2,1/2), setting in below the antiferromagnetic ordering temperature, TN, and an ellipse-shaped structure of weaker intensity lobes that connect equivalent R points [1]. In the present proposal, we suggest to map out the full energy-momentum space with high energy resolution on the same sample, using time-of-flight spectrometer IN5, in order to investigate the full 3D momentum structure of the newly discovered excitations and their energy dependence.
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Dmytro Inosov; FRIEMEL Gerd; JANG Hoyoung; KEIMER Bernhard; NASSAR Roy; OLLIVIER Jacques and PORRAS PEREZ GUERRERO Juan Pablo. (2012). Dispersion of low-energy resonant spin excitations in CeB6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1232
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