arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1109.1071cond-mat.str-el
收藏

竞争磁相互作用对CuCrS2和CuCrSe2电子性质的影响

The effects of competing magnetic interactions on the electronic properties of CuCrS2 and CuCrSe2

Girish C Tewari, T S Tripathi, A K Rastogi

摘要:

本文详细研究了反铁磁层状化合物CuCrS_2和CuCrSe_2在2K-300 K温度范围内的电阻率、热电势、磁化率\c{hi}和热容CP。CuCrS 2在\c{hi}中显示出尖锐的尖点,并且在TN = 40 K时在CP中显示出类似于3D磁序的峰,而更多金属化的CuCrSe 2在\c{hi}中显示出圆形的最大值,并且在55 K附近在CP中不存在尖锐的峰,低温下的CP具有T2依赖性,这表明在其磁相中不存在长程序和2D自旋液体样激发。我们解释了硒化物化合物中磁序的缺失是由于来自远距离邻居的磁相互作用的有效竞争造成的;在更多的金属硒化物化合物中,层内Cr原子之间的间接交换增加,这与不同层的Cr原子之间的直接反铁磁相互作用竞争,这破坏了长程磁序。

英文摘要:

We present a detail study of the electrical resistivity, thermoelectric power, magnetic susceptibility \c{hi} and the heat capacity CP in antiferromagnetic layered compounds CuCrS2 and CuCrSe2 at 2K-300K. CuCrS2 showed sharp cusp in \c{hi} and a lambda-like peak in CP at TN = 40K as expected for a 3D- magnetic order, while more metallic CuCrSe2 showed a rounded maximum in \c{hi} and the absence of sharp peak in CP around 55K, the CP at low temperature has T2-dependence in it which suggests the absence of the long range order and 2D spin-liquid like excitation in its magnetic phase. We explain the absence of the magnetic order in the selenide compound as resulting from the effective competition of the magnetic interactions from the distant neighbors; the indirect exchange among the intra-layer Cr-atoms increases in more metallic selenide compound which competes with the direct antiferromagnetic interactions between the Cr-atoms of different layers which destroys the long range magnetic order.

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。

↑