Due to the existence of the spin quantum effect, the low-dimensional magnetic material will exhibit a different magnetic ground state than the three-dimensional magnetic material. For two-dimensional spin systems, the competition between quantum fluctuations and thermal fluctuations will dominate the magnetic phase transition behavior, and long program antiferromagnetic phase transitions may overcome quantum fluctuations. However, magnetic materials containing a triangular spin grid, especially a kagome lattice, have a strong geometrical frustration and the effects of quantum spin fluctuations can prevent long-range ordered ground states from forming. The exploration of ordered-disorder quantum phase transitions in low-dimensional magnetic materials and the elucidation of their mechanisms are basic physics issues that need to be fully understood in the related electronic systems. It is the most important research hotspot in materials science and condensed matter physics. one.
Recently, the research group He Changzhen of the State Key Laboratory of Structural Chemistry of the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences has prepared the isotactic compound BiOCu2(XO3)(SO4)(OH)H2O [X = Te(1) , Se(2)]. The series of compounds has a typical two-dimensional layered structure, and the planar topology of the divalent Cu2+ magnetic ions is a novel spin lattice interposed between the kagome lattice and the star lattice. The results of magnetic measurements show that compound 1 has a non-magnetic spin gap ground state, while compound 2 shows an antiferromagnetically ordered state below 24K. The theoretical calculations show that the ground state of the spin gap of compound 1 may be due to the dimerization of Cu2+ ions, and the antiferromagnetic ground state of compound 2 overcomes the dimerization of Cu2+ ions. This phenomenon of order-disorder quantum transformation induced by non-magnetic ion substitution is rare in the two-dimensional kagome lattice-related system. The research results were published in the American Chemical Society.
The research work was supported by the National Natural Science Foundation of China and the key deployment projects of the Chinese Academy of Sciences.
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