Quasi-two-dimensional S = 1/2 magnetism of Cu[C_6H_2(COO)_4][C_2H_5NH_3]_2

R. Nath; M. Padmanabhan; S. Baby; A. Thirumurugan; D. Ehlers; M. Hemmida; H.-A. Krug von Nidda; A. A. Tsirlin

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Quasi-two-dimensional S = 1/2 magnetism of Cu[C_6H_2(COO)_4][C_2H_5NH_3]_2

机译：准二维S = Cu [C_6H_2（COO）_4] [C_2H_5NH_3] _2的1/2磁性

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摘要

We report structural and magnetic properties of the spin-1/2 quantum antiferromagnet Cu[C_6H_2(COO)_4][C_2H_5NH_3]_2 by means of single-crystal x-ray diffraction, magnetization, heat capacity, and electron-spin-resonance (ESR) measurements on polycrystalline samples, as well as band-structure calculations. The triclinic crystal structure of this compound features CuO_4 plaquette units connected into a two-dimensional framework through anions of the pyromellitic acid [C_6H_2(COO)_4]~(4-). The ethylamine cations [C_2H_5NH_3]~+ are located between the layers and act as spacers. Magnetic susceptibility and heat capacity measurements establish a quasi-two-dimensional, weakly anisotropic, and nonfrustrated spin-1/2 square lattice with the ratio of the couplings J_a/J_c approx= 0.7 along the a and c directions, respectively. No clear signatures of the long-range magnetic order are seen in thermodynamic measurements down to 1.8 K. However, the gradual broadening of the ESR line suggests that magnetic ordering occurs at lower temperatures. Leading magnetic couplings are mediated by the organic anion of the pyromellitic acid and exhibit a nontrivial dependence on the Cu-Cu distance, with the stronger coupling between those Cu atoms that are farther apart.

机译：我们通过单晶X射线衍射，磁化强度，热容和电子自旋共振（（ ESR）对多晶样品的测量以及能带结构的计算。该化合物的三斜晶体结构具有通过均苯四酸[C_6H_2（COO）_4]〜（4-）的阴离子连接成二维骨架的CuO_4片状单元的特征。乙胺阳离子[C_2H_5NH_3]〜+位于这些层之间，并充当间隔基。磁化率和热容量测量建立了一个准二维，弱各向异性且无阻的自旋1/2方形晶格，其耦合J_a / J_c的比率分别沿a和c方向约为0.7。在低至1.8 K的热力学测量中，没有看到远距离磁序的清晰信号。但是，ESR线的逐渐加宽表明，磁序在较低的温度下发生。领先的磁偶合是由均苯四酸的有机阴离子介导的，并且表现出对Cu-Cu距离的非平凡依赖，在距离较远的那些Cu原子之间具有较强的偶合。

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来源
《Physical review》 |2015年第5期|054409.1-054409.9|共9页
作者
R. Nath; M. Padmanabhan; S. Baby; A. Thirumurugan; D. Ehlers; M. Hemmida; H.-A. Krug von Nidda; A. A. Tsirlin;
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作者单位

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

School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, Kerala, India,School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India,Department of Chemistry, Amrita University, Amritapuri, Kollam-690525, Kerala, India;

School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India;

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

Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, 86135 Augsburg, Germany;

Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, 86135 Augsburg, Germany;

Experimentalphysik V, Center for Electronic Correlations and Magnetism, Institute for Physics, Augsburg University, 86135 Augsburg, Germany;

National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia;

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exchange and superexchange interactions; antiferromagnetics; other inorganic compounds; inorganic compounds;

机译：交换和超级交换互动;反铁磁其他无机化合物;无机化合物;

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机译：准二维$ s = 1/2 $磁性的铜[C $ 1-6 $ H $ _2 $（COO）$ _ 4 $] [C $ _2 $ H $ $ _5 NH $ _3 $] $ _ 2 $
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Quasi-two-dimensional S = 1/2 magnetism of Cu[C_6H_2(COO)_4][C_2H_5NH_3]_2

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