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首页> 外文期刊>Physical review >Magnetic properties of the spin trimer compound Ca_3Cu_2Mg(PO_4)_4 from susceptibility measurements
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Magnetic properties of the spin trimer compound Ca_3Cu_2Mg(PO_4)_4 from susceptibility measurements

机译：从磁化率测量中自旋三聚体化合物Ca_3Cu_2Mg（PO_4）_4的磁性

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摘要

The effect of the substitution of one Cu~(2+) ion (S= 1/2) by Mg~(2+) ion (S=0) on the magnetic property of the linear-chain spin trimer compound Ca_3Cu_3(PO_4)_4 was studied using dc magnetic susceptibility in Ca_3Cu_2Mg(PO_4)_4 together with those in Ca_3Cu_3(PO_4)_4 and Ca_3Cu_2Ni(PO_4)_4 for comparison. A remarkable difference is observed among the results obtained in the Mg and the Ni substituted compounds. A clear signature of the reduction in the net spin of the trimers in Ca_3Cu_2Mg(PO_4)_4 was found below 65 K, which is compatible with the presence of the Cu2-Cul-Mg trimers in the singlet ground state, together with those of the type Cu2-Cul-Cu2 and Mg-Cul-Mg in the doublet state. However, no signature of the reduction in the net spin of the trimers was observed in Ca_3Cu_2Ni(PO_4)_4. This finding suggests that the type of trimers present in Ca_3Cu_2Mg(PO_4)_4 and Ca_3Cu_2Ni(PO_4)_4 are different. Furthermore, a singlet ground state is partially realized in a quantum spin trimer system Ca_3Cu_2Mg(PO_4)_4.
机译：Mg〜（2+）离子（S = 0）取代一个Cu〜（2+）离子（S = 1/2）对直链自旋三聚体化合物Ca_3Cu_3（PO_4）磁性的影响比较了Ca_3Cu_2Mg（PO_4）_4和Ca_3Cu_3（PO_4）_4和Ca_3Cu_2Ni（PO_4）_4中的dc磁化率，研究了_4。在用Mg和Ni取代的化合物中获得的结果之间观察到显着差异。在65 K以下发现Ca_3Cu_2Mg（PO_4）_4中三聚体的净自旋减少的明显特征，这与单线基态的Cu2-Cul-Mg三聚体的存在和类型为Cu2-Cul-Cu2和Mg-Cul-Mg的双峰态。但是，在Ca_3Cu_2Ni（PO_4）_4中未观察到三聚体的净自旋降低的迹象。这一发现表明，Ca_3Cu_2Mg（PO_4）_4和Ca_3Cu_2Ni（PO_4）_4中存在的三聚体类型不同。此外，在量子自旋三聚体系统Ca_3Cu_2Mg（PO_4）_4中部分地实现了单重态基态。

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  • 来源
    《Physical review》 |2010年第9期|p.094401.1-094401.5|共5页
  • 作者

    M. Ghosh; M. Majumder; K. Ghoshray; S. Banerjee;

  • 作者单位

    Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

    Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

    Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

    Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

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  • 正文语种 eng
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  • 关键词

    spin chain models; manganites; antiferromagnetics;

    机译：自旋链模型;锰矿;反铁磁;

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