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arXiv 1602.08174cond-mat.str-elcond-mat.mtrl-sci
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二维CrPS4单晶的自旋动力学、电子和热输运性质

Spin dynamics, electronic and thermal transport properties of two-dimensional CrPS4 single crystal

Q. L. Pei, X. Luo, G. T. Lin, J. Y. Song, L. Hu, Y. M. Zou, L. Yu, W. Tong, W. H. Song, W. J. Lu, Y. P. Sun

摘要:

2-用化学气相输运法生长了二维CrPS 4单晶。通过室温X射线衍射、电阻率\r{ho}(T)、比热容CP(T)和电子自旋响应(ESR)测试,研究了该材料的晶体学、磁性、电子输运和热输运性质。CrPS 4晶体结晶成单斜结构。电阻率\r{ho}(T)显示出半导体行为,其中能隙Ea=0.166 eV。反铁磁(AFM)转变温度约为TN=36 K。沿c轴观察到由外加磁场引起的自旋翻转。讨论了CrPS_4单晶的磁相图。在TN处提取的磁熵约为10.8J/mol K,这与Cr ~(3+)离子S = 3/2时的理论值Rln(2S + 1)一致。根据平均场论,对TN以上磁化率进行拟合,得到层内和层间相互作用对应的磁交换常数J_1和J_c分别为0.143和-0.955 meV,与ESR测量结果一致。借助应变调节磁性,单层CrPS 4可能是开发二维磁性半导体的一个有希望的候选者。

英文摘要:

2-Dimensional (2D) CrPS4 single crystals have been grown by the chemical vapor transport method. The crystallographic, magnetic, electronic and thermal transport properties of the single crystals were investigated by the room-temperature X-ray diffraction, electrical resistivity \r{ho}(T), specific heat CP(T) and the electronic spin response (ESR) measurements. CrPS4 crystals crystallize into a monoclinic structure. The electrical resistivity \r{ho}(T) shows a semiconducting behavior with an energy gap Ea=0.166 eV. The antiferromagntic (AFM) transition temperature is about TN=36 K. The spin flipping induced by the applied magnetic field is observed along the c axis. The magnetic phase diagram of CrPS4 single crystal has been discussed. The extracted magnetic entropy at TN is about 10.8 J/mol K, which is consistent with the theoretical value R ln(2S + 1) for S = 3/2 of the Cr3+ ion. Based on the mean-field theory, the magnetic exchange constants J1 and Jc corresponding to the interactions of the intralayer and between layers are about 0.143 meV and -0.955 meV are obtained based on the fitting of the susceptibility above TN, which agree with the results obtained from the ESR measurements. With the help of the strain for tuning the magnetic properties, monolayer CrPS4 may be a promising candidate to explore 2D magnetic semiconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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