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arXiv 1906.01281cond-mat.mes-hall
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GdCl3填充碳纳米管中自旋-声子耦合的观察

Observation of spin-phonon coupling in GdCl3 filled carbon nanotubes

S. Ncube, R. Erasmus, S. Bhattacharyya

摘要:

通过变温磁谱和偏振拉曼光谱研究了钆填充双壁碳纳米管(GdCl3@DWNTs)中自旋-声子耦合的增强效应.随温度变化的磁化率测量表明,GdCl3@DWNTs在低于100 K的温度下发生超顺磁相变,其阻断温度约为47 K.从温度依赖的PRS,它是观察到,一个独特的声子硬化发生的G-带模式在温度接近超顺磁性相的发病。这与原始DWNTs相比,其中声子模式在低温下饱和到恒定频率。声子频率的突然增加指示显著的自旋-声子耦合。GdCl3@DWNTs中增强的耦合被认为是由于随着温度降低纳米管声子模式和自旋翻转频率之间的共振而发生的。

英文摘要:

The enhancement of spin-phonon coupling in gadolinium filled double walled carbon nanotubes (GdCl3@DWNTs) is demonstrated through temperature dependent magnetrometry and polarized Raman Spectroscopy (PRS). Temperature dependent susceptibility measurements show that the GdCl3@DWNTs undergo a superparamagnetic phase transion at temperatures below 100 K with a blocking temperature at approximately 47 K. From the temperature dependent PRS, it is observed that a distinct phonon hardening occurs for the G-band modes at temperatures close to the onset of the superparamagentic phase. This is in contract to pristine DWNTs where phonon modes saturates to a constant frequency at low temperatures. The abrupt increase in phonon frequency is indicative of a pronounced spin-phonon coupling. The enhanced coupling in the GdCl3@DWNTs is believed to occur due to resonance between nanotube phonon mode and spin flip frequency as temperature decreases.

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