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首页> 外文期刊>Physical review >Magnetic properties of the one-dimensional S = 3/2 Heisenberg antiferromagnetic spin-chain compound Na_2Mn_3O_7
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Magnetic properties of the one-dimensional S = 3/2 Heisenberg antiferromagnetic spin-chain compound Na_2Mn_3O_7

机译：一维S = 3/2 Heisenberg反铁磁性旋转链复合物NA_2MN_3O_7的磁性特性

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摘要

We have performed magnetic susceptibility (x), heat capacity (C_p), and nuclear magnetic resonance (NMR) measurements on the layered compound Na_2Mn_3O_7 in which the magnetic Mn~(4+) ions constitute a maple-leaf lattice. At high temperature, ⅹ follows the Curie-Weiss (CW) law with CW temperature as high as 152 K and Mn~(4+) ions are found to be in the high-spin state (S =3/2). With decreasing temperature, ⅹ passes through a broad maximum at 115 K and decreases rapidly at low temperature. A similar broad peak appears at around 62 K in the magnetic contribution to heat capacity (C_m). The temperature dependence of ⅹ and C_m are the characteristics of an one-dimensional Heisenberg antiferromagnetic spin chain with a nonmagnetic ground state. The obtained values of spin-gap energy (A,) and nearest-neighbor antiferromagnetic exchange coupling (J) are 28 and 27 K, respectively. There is no evidence of a long-range magnetic ordering down to 2 K in heat capacity data, in agreement with spin-singlet ground state. These observations are further corroborated by ~(23)Na NMR studies through measurements of both the NMR shift and the spin-lattice relaxation rate.
机译：我们在层状化合物NA_2MN_3O_7上进行了磁化率（X），热容量（C_P）和核磁共振（NMR）测量，其中磁性Mn〜（4 +）离子构成枫叶晶格。在高温下，ⅹ遵循CW温度的CW-Weiss（CW）定律，高达152 k和Mn〜（4+）离子在高旋转状态（S = 3/2）。随着温度的降低，ⅹ通过115 k的宽最大值，在低温下快速降低。在磁力贡献到热容量（C_M），类似的宽峰出现在62 k左右。 χ和C_M的温度依赖性是具有非磁性接地状态的一维Heisenberg反铁磁旋转链的特性。所获得的旋转间隙能量（a，）和最近邻 - 反铁磁交换耦合（j）的值分别为28和27k。没有证据表明在热容量数据中的远程磁性下降至2K，同时与旋转单线相对的地位。通过NMR移位和旋转晶格松弛率的测量，通过测量〜（23）NA NMR研究进一步证实了这些观察结果。

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  • 来源
    《Physical review》 |2020年第18期|184429.1-184429.8|共8页
  • 作者

    Chandragiri Venkatesh; Bilwadal Bandyopadhyay; Arindam Midya; Krishnan Mahalingam; V. Ganesan; Prabhat Mandal;

  • 作者单位

    Saha Institute of Nuclear Physics HBNI 1 /AF Bidhannagar Calcutta 700064 India;

    Saha Institute of Nuclear Physics HBNI 1 /AF Bidhannagar Calcutta 700064 India;

    Saha Institute of Nuclear Physics HBNI 1 /AF Bidhannagar Calcutta 700064 India;

    UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore 452001 India;

    UGC-DAE Consortium for Scientific Research University Campus Khandwa Road Indore 452001 India;

    Saha Institute of Nuclear Physics HBNI 1 /AF Bidhannagar Calcutta 700064 India;

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