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Low-temperature magnetization (M) measurements down to 0.1 K have beenperformed in magnetic fields up to 14.5 T for a single piece of a tinysingle-crystalline sample (0.2 mg weight) of the spin-gap system YbAl3C3. Atthe base temperature of 0.1 K, several metamagnetic transitions were clearlyobserved for H // c in the range 6 T < H < 9 T whereas only two transitionswere observed, one at 4.8 T and the other at 6.6 T, for H // a. At fields above9 T, the magnetization becomes almost saturated for both H // a and H // c. Thepresent results indicate that a singlet-triplet crossover occurs in arelatively narrow field range, suggesting a rather weak interdimer interactionin spite of the nearly triangular lattice of Yb ions.

Singlet-triplet Crossover in the Two-dimensional Dimer Spin System YbAl3C3