Synthesis and properties of HoT2Al20 (T = Ti, V, Cr) intermetallic cage compounds
Polycrystalline samples of HoT2Al20 (T = Ti, V, Cr) intermetallics were synthesized using a step-wise arc-melting technique. All three compounds adopt the CeCr2Al20-type crystal structure with Ho atoms positioned inside oversized icosahedral cages formed by Al atoms. The structure of HoV2Al20 compound is reported. The materials properties were studied by means of electrical resistivity, magnetic susceptibility, and specific heat measurements. All three compounds show a Curie-Weiss paramagnetic behavior down to 1.95 K. Specific heat measurements show the presence of electronic Schottky anomaly resulting from crystal-field splitting of Ho3+ energy levels in the three compounds, while in HoTi2Al20 and HoV2Al20 a second anomaly was observed, resulting from the presence of low-energy Einstein phonon mode.
Michał Jerzy Winiarski, Tomasz Klimczuk. (2017). Synthesis and properties of HoT2Al20 (T = Ti, V, Cr) intermetallic cage compounds, 85, 103-109. https://doi.org/10.1016/j.intermet.2017.02.005
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