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Singlet-triplet Crossover in the Two-dimensional Dimer Spin System YbAl3C3
Shunichiro Kittaka,Tomoyoshi Sugiyama,Yasuyuki Shimura,Toshiro Sakakibara,Saori Matsuda,Akira Ochiai 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Low-temperature magnetization (M) measurements down to 0.1 K have been performed in magneticfields up to 14.5 T for a single piece of a tiny single-crystalline sample ( 0.2 mg weight) ofthe spin-gap system YbAl3C3. At the base temperature of 0.1 K, several metamagnetic transitionswere clearly observed for H k c in the range 6 T < µ0H < 9 T whereas only two transitions wereobserved, one at 4.8 T and the other at 6.6 T, for H k a. At fields above 9 T, the magnetization becomesalmost saturated for both H k a and H k c. The present results indicate that a singlet-tripletcrossover occurs in a relatively narrow field range, suggesting a rather weak interdimer interactionin spite of the nearly triangular lattice of Yb ions.