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Hindered magnetic order from mixed dimensionalities in CuP_2O_6

机译：CuP_2O_6中混合维度的受阻磁阶

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摘要

We present a combined experimental and theoretical study of the spin-1/2 compound CuP_2O_6 that features a network of two-dimensional (2D) antiferromagnetic (AFM) square planes, interconnected via one-dimensional (1D) AFM spin chains. Magnetic susceptibility, high-field magnetization, and electron spin resonance (ESR) data, as well as microscopic density-functional band-structure calculations and subsequent quantum Monte Carlo simulations, show that the coupling J_(2D) (～) 40 K in the layers is an order of magnitude larger than J_(1D) (～) 3 K in the chains. Below T_N (～) 8 K, CuP_2O_6 develops long-range order, as evidenced by a weak net moment on the 2D planes induced by anisotropic magnetic interactions of Dzyaloshinsky-Moriya type. A striking feature of this 3D ordering transition is that the 1D moments grow significantly slower than the ones on the 2D units, which is evidenced by the persistent paramagnetic ESR signal below T_N. Compared to typical quasi-2D magnets, the ordering temperature of CuP_2O_6 T_N/J_(2D) (～) 0.2 is unusually low, showing that weakly coupled spins sandwiched between 2D magnetic units effectively decouple these units and impede the long-range ordering.
机译：我们提出了自旋1/2化合物CuP_2O_6的组合实验和理论研究，该化合物具有通过一维（1D）AFM自旋链互连的二维（2D）反铁磁（AFM）方平面网络。磁化率，高场磁化强度和电子自旋共振（ESR）数据，以及微观密度函数能带结构计算和随后的量子蒙特卡洛模拟，表明耦合的J_（2D）（〜）40 K层比链中的J_（1D）（〜）3 K大一个数量级。在T_N（〜）8 K以下，CuP_2O_6产生长程有序，这是由Dzyaloshinsky-Moriya型各向异性磁相互作用在二维平面上产生的弱净矩所证明的。此3D有序过渡的显着特征是1D力矩的增长明显慢于2D单位上的力矩，这由T_N以下的持续顺磁ESR信号证明。与典型的准2D磁体相比，CuP_2O_6 T_N / J_（2D）（〜）0.2的有序温度异常低，这表明夹在2D磁性单元之间的弱耦合自旋有效地解耦了这些单元并阻碍了长距离有序化。

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  • 来源
    《Physical review》 |2014年第1期|014407.1-014407.11|共11页
  • 作者

    R. Nath; K. M. Ranjith; J. Sichelschmidt; M. Baenitz; Y. Skourski; F. Alet; I. Rousochatzakis; A. A. Tsirlin;

  • 作者单位

    School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India;

    School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany;

    Laboratoire de Physique Theorique, Universite de Toulouse and CNRS, UPS (IRSAMC), 31062 Toulouse, France;

    Institute for Theoretical Solid State Physics, IFW Dresden, 01171 Dresden, Germany;

    Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany ,National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia;

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  • 正文语种 eng
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  • 关键词

    exchange and superexchange interactions; antiferromagnetics; quantized spin models; other inorganic compounds;

    机译：交换和超级交换互动;反铁磁量化自旋模型其他无机化合物;

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