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arXiv 1407.2277cond-mat.str-el
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金属间化合物CeCuBi2的物理性质和磁结构

Physical properties and magnetic structure of the intermetallic CeCuBi2 compound

C. Adriano, P. F. S. Rosa, C. B. R. Jesus, J. R. L. Madergan, T. M. Garitezi, T. Grant, Z. Fisk, D. J. Garcia, A. P. Reyes, P. L. Kuhns, R. R. Urbano, C. Giles, P. G. Pagliuso

摘要:

本工作结合磁化强度、压变电阻率、热容、~(63)Cu核磁共振(NMR)和X射线共振磁散射实验研究了CeCuBi_2金属间化合物的物理性质。我们的单晶在TN ~ 16 K显示出反铁磁有序,磁性表明该化合物是一种Ising反铁磁体。特别是,低温磁化数据揭示了自旋触发器转变在T = 5 K时,磁场约5.5 T沿c轴施加。此外,TN以下的X射线磁衍射数据揭示了一种相当的反铁磁结构,其传播波矢为(0 0 1/2),Ce^3+的磁矩沿c轴取向。此外,我们的热容,压力相关的电阻率和温度相关的63 Cu NMR数据表明,CeCuBi 2表现出弱重费米子行为,具有强烈的局域Ce^3+ 4f电子。因此,我们讨论了一个方案,考虑到Ce^3+离子之间的各向异性磁相互作用以及CeCuBi 2中的四晶电场效应。

英文摘要:

In this work, we combined magnetization, pressure dependent electrical resistivity, heat-capacity, 63Cu Nuclear Magnetic Resonance (NMR) and X-ray resonant magnetic scattering experiments to investigate the physical properties of the intermetallic CeCuBi2 compound. Our single crystals show an antiferromagnetic ordering at TN ~ 16 K and the magnetic properties indicate that this compound is an Ising antiferromagnet. In particular, the low temperature magnetization data revealed a spin-flop transition at T = 5 K when magnetic fields about 5.5 T are applied along the c-axis. Moreover, the X-ray magnetic diffraction data below TN revealed a commensurate antiferromagnetic structure with propagation wavevector (0 0 1/2) with the Ce^3+ moments oriented along the c-axis. Furthermore, our heat capacity, pressure dependent resistivity and temperature dependent 63Cu NMR data suggest that CeCuBi2 exhibits a weak heavy fermion behavior with strongly localized Ce^3+ 4f electrons. We thus discuss a scenario taking into account the anisotropic magnetic interaction between the Ce^3+ ions along with the tetragonal crystalline electric field effects in CeCuBi2.

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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