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首页> 外文期刊>Journal of the Physical Society of Japan >Antiferromagnetic ground state in organic quasi-ID ferromagnet gamma-phase para-nitrophenyl nitronyl nitroxide
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Antiferromagnetic ground state in organic quasi-ID ferromagnet gamma-phase para-nitrophenyl nitronyl nitroxide

机译：有机准ID铁磁体γ相对-硝基苯基硝酰氮氧化物中的反铁磁基态

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摘要

We have studied the ground state of an organic quasi-one-dimensional (Q]D) ferromagnet, the gamma-phase para-nitrophenyl nitronyl nitroxide (gamma-p-NPNN), by low-frequency ESR and magnetic torque measurements, and have found that it is an anti ferro magnetically ordered state with an orthorhombic anisotropy. Antiferromagnetic resonance (AFMR) modes are observed below 0.6 K. From the angle dependence of AFMR, the spin easy axis is found to point the [011] direction. The spin-flop (SF) field is estimated to be 520 Oe. From the analysis of the AFMR modes in terms of a mean-field approximation, we have estimated the interchain interactions and the anisotropy field parameters in the ground state. The magnetic phase diagram along the spin easy axis has been determined using a high sensitive microcantilever technique. On the field dependence along the easy axis, the torque response shows anomalies at 520 Oe and around 2100 Oe, corresponding to the spin-flop and the full-polarization of spins, respectively. The easy axis and anisotropy in the antiferromagnetic state are found to be well explained by our calculations of the dipolar energy with respect to the spin structure obtained in this 41 work.
机译：我们已经通过低频ESR和磁转矩测量研究了有机准一维（Q] D铁磁体，γ相对硝基苯基硝酰基硝基氧（γ-p-NPNN）的基态，并且具有发现它是具有正交各向异性的反铁磁有序状态。在0.6 K以下观察到反铁磁共振（AFMR）模式。根据AFMR的角度依赖性，发现自旋容易轴指向[011]方向。自旋（SF）字段估计为520 Oe。通过根据平均场近似对AFMR模式进行分析，我们估算了基态下的链间相互作用和各向异性场参数。已经使用高灵敏度微悬臂梁技术确定了沿自旋轴的磁相图。关于沿易轴的场依赖性，扭矩响应显示在520 Oe和2100 Oe附近的异常，分别对应于自旋触发器和自旋的全极化。通过我们对这41个工作中获得的自旋结构的偶极能量的计算，可以很好地说明反铁磁状态下的易轴和各向异性。

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