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Long-range magnetic ordering of S=1/2 linear trimers in A3Cu3(PO4)4 (A=Ca, Sr, and Pb) |
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| Authors: | Alexei A Belik Akira Matsuo Koichi Kindo |
| Institution: | a Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan b PRESTO, Japan Science and Technology Corporation (JST), Kawaguchi, Saitama 332-0012, Japan c KYOKUKEN, Osaka University, Toyonaka, Osaka 560-8531, Japan |
| Abstract: | Magnetic properties of S=1/2 linear trimer cluster compounds A3Cu3(PO4)4 (A=Ca, Sr, and Pb) were investigated. Magnetic susceptibility data for the three compounds showed that paramagnetic copper spins form trimers with the total spin of 1/2 below about 45 K. Specific heat and magnetization measurements indicated that the trimer clusters undergo ferromagnetic long-range ordering at  for A=Ca and antiferromagnetic long-range ordering at  for A=Sr and  for A=Pb. A3Cu3(PO4)4 exhibited 1/3-magnetization plateau at least up to magnetic field of 55 T at 1.3 and 4.2 K. A3Cu3(PO4)4 with A=Sr and Pb showed a spin-flop transition near 0.03 T in the antiferromagnetic state at 0.08 K. Specific heat data at magnetic fields clearly showed broad maxima at low temperatures due to the finite intra-chain interaction in one-dimensional arrays of the trimers. |
| Keywords: | Heisenberg antiferromagnet Trimer system Magnetic susceptibility Specific heat High-field magnetization |
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