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<p>KNi(PO<sub>3</sub>)<sub>3</sub> was successfully synthesized by solid-state method and the magnetic properties were characterized. The crystal structure of KNi(PO<sub>3</sub>)<sub>3</sub> belongs to trigonal crystal system with space group <i>R</i>3, where Ni<sup>2+</sup> ions form the distorted honeycomb-lattice within the ab-plane stacking in the “ABAB” type fashion along the <i>c</i>-axis. Magnetization measurements reveal the presence of antiferromagnetic (AFM) interaction with Curie Weiss (CW) temperature θ<sub>CW</sub> =  − 12.905&#xa0;K but without long-range magnetic order down to 2&#xa0;K. Notably, the CW fitted effective moment µ<sub>eff</sub> = 3.35µ<sub>B</sub> and saturated magnetization <i>M</i><sub>S</sub> = 2<i>μ</i><sub>B</sub>/Ni<sup>2+</sup> at 2&#xa0;K support KNi(PO<sub>3</sub>)<sub>3</sub> as an <i>S</i> = 1 spin system. Intriguingly, the zero-field specific heat exhibits a broad peak maximized at ~ 2.5&#xa0;K indicating the onset of short-range spin correlation between Ni<sup>2+</sup> ions, while the integrated magnetic entropy (<i>S</i><sub>mag</sub>) is close to the expected Rln3 for <i>S</i> = 1 system, indicative of large spin fluctuation below 2&#xa0;K driven by spin frustration.</p>

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Synthesis, Crystal Structure, and Magnetic Characterization on a Frustrated S = 1 Magnet KNi(PO3)3

  • 期刊论文

  • 发表日期：

    2025年3月17日

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  • Xiaofeng Li,
  • Yuxia Gao,
  • Zhaoming Tian,
  • Weijie Ren,
  • Xin Sun,
  • Mingli Wang

摘要

KNi(PO3)3 was successfully synthesized by solid-state method and the magnetic properties were characterized. The crystal structure of KNi(PO3)3 belongs to trigonal crystal system with space group R3, where Ni2+ ions form the distorted honeycomb-lattice within the ab-plane stacking in the “ABAB” type fashion along the c-axis. Magnetization measurements reveal the presence of antiferromagnetic (AFM) interaction with Curie Weiss (CW) temperature θCW =  − 12.905 K but without long-range magnetic order down to 2 K. Notably, the CW fitted effective moment µeff = 3.35µB and saturated magnetization MS = 2μB/Ni2+ at 2 K support KNi(PO3)3 as an S = 1 spin system. Intriguingly, the zero-field specific heat exhibits a broad peak maximized at ~ 2.5 K indicating the onset of short-range spin correlation between Ni2+ ions, while the integrated magnetic entropy (Smag) is close to the expected Rln3 for S = 1 system, indicative of large spin fluctuation below 2 K driven by spin frustration.