Evidence of a Field-Induced Ordering in YbCo2Zn20 in a [111] Magnetic Field

概要

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DC magnetization (M) measurements were done on a single crystal of YbCo2Zn20 at very low temperatures (T) down to 0.07 K in magnetic fields H\parallel[111]. In addition to the metamagnetic behavior at \mu_{0}H_{\text{m}}=0.6 T already known, we found a new metamagnetic transition at \mu_{0}H'_{\text{m}}=6 T whose critical field moves to higher fields with increasing T. Moreover, in fields above 6 T, temperature dependence of the magnetization M(T) shows a kink below 0.6 K. These anomalies indicate the presence of a new field-induced ordered phase. In addition, a broad peak is observed in M(T) in fields above 3 T outside the ordered phase. These results are best explained by a level crossing of the low-lying crystalline-electric-field state with the ground state, possibly assisted by a valence change in magnetic fields.
2011-07-15