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The strongly correlated system Ho11B12 with boron sublattice Jahn-Tellerinstability and nanoscale electronic phase separation (dynamic charge stripes)was studied in detail by inelastic neutron scattering (INS), magnetometry andheat capacity measurements at temperatures in the range 3-300 K. From theanalysis of registered INS spectra, we determined parameters of the cubiccrystal field at holmium sites, B4=- 0.333 meV and B6= -2.003 meV (in Stevensnotations), with an unconventional large ratio B6/B4 pointing on the dominantrole of conduction electrons in the formation of a crystal field potential. Themolecular field in the antiferromagnetic state, Bloc = (1.75+- 0.1) T has beendirectly determined from the INS spectra together with short-range ordereffects detected in the paramagnetic state. A comparison of measuredmagnetization in diluted Lu0.99Ho0.01B12 and concentrated HoB12 single crystalsshowed a strong suppression of Ho magnetic moments by antiferromagneticexchange interactions in holmium dodecaboride. To account explicitly for theshort-range antiferromagnetic correlations, a self-consistent holmium dimermodel was developed that allowed us to reproduce successfully field andtemperature variations of the magnetization and heat capacity in the cage-glassphase of HoB12 in external magnetic fields.

physical review. b./physical review. b

Crystal field potential and short-range order effects in inelastic  neutron scattering, magnetization and heat capacity of the cage-glass  compound HoB12