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Long-range magnetic ordering of quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Sr2Cu(PO4)2 |
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| Authors: | Alexei A Belik Shinya Uji Eiji Takayama-Muromachi |
| Institution: | a International Center for Young Scientists, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan b Nano-quantum Transport Group, Nanomaterials Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan c Advanced Materials Laboratory, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan |
| Abstract: | Magnetic properties of quasi-one-dimensional S=1/2 Heisenberg antiferromagnet Sr2Cu(PO4)2 were investigated by temperature and field dependence of AC susceptibility down to 0.03 K. A sharp peak was observed at  on the temperature dependence of AC susceptibility indicating long-range magnetic ordering. Taking into account the exchange constant,  (Hamiltonian =J∑SiSi+1), the ratio kBTN/J is 0.06%. Sr2Cu(PO4)2 is, therefore, one of the best one-dimensional Heisenberg antiferromagnet known so far. |
| Keywords: | Copper phosphate Heisenberg antiferromagnet One-dimensional system AC magnetic susceptibility Long-range ordering |
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