Quantum criticality and suppression of the exciton mode in Ce{0.72}La{0.28}B{6}
We have recently reported the discovery of a magnetic exciton mode in the heavy-fermion antiferromagnet CeB6, whose behavior bears similarities with that of the spin resonant mode in superconductors. We have argued that this mode, originating from fluctuations of the antiferroquadrupolar (AFQ) order parameter, is stabilized due to the opening of a gap in the particle-hole continuum associated with the antiferromagnetic (AFM) order that sets in below T_N = 2.3 K at a different wave vector. We suggest to verify this interpretation with measurements of a similar Ce{0.72}La{0.28}B{6} compound, in which partial dilution of the Ce sublattice by nonmagnetic La ions suppresses the AFM transition. The AFM order can be restored by applying magnetic field, 0 < B < 2.3 T, along the <110> direction, beyond which it is suppressed again, giving way to the AFQ phase. This represents ideal conditions for checking experimentally if the exciton mode is indeed linked to T_N. In addition, we would be also interested in establishing the so-called E/T scaling of dynamical susceptibility close to the quantum critical point.
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JANG Hoyoung; FRIEMEL Gerd; GHAMBASHIDZE Giorgi; Dmytro Inosov; IVANOV Alexandre; KEIMER Bernhard; PIOVANO Andrea and TSENG Kuo Feng. (2013). Quantum criticality and suppression of the exciton mode in Ce{0.72}La{0.28}B{6}. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1251
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