Resonant magnetoabsorption of millimeter-wave radiation in the quasi-two-dimensional organic metals alpha -(BEDT-TTF)2MHg(SCN)4 (M=K,Tl).
Resonant magnetoabsorption of millimeter-wave radiation in the quasi-two-dimensional organic metals alpha -(BEDT-TTF)2MHg(SCN)4 (M=K,Tl).
复制标题
准二维有机金属α-(BEDT-TTF)2MHg(SCN)4 (M=K,Tl)中毫米波辐射的共振磁吸收。
DOI：
10.1103/physrevb.53.12794
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Kushch
中科院分区：
文献类型：
--
作者：
Demishev;Semeno;Sluchanko;Samarin;Voskoboinikov;Glushkov;Singleton;Blundell;Hill;Hayes;Kartsovnik;Kovalev;Kurmoo;Day;Kushch
在30-120 GHz频率范围内，研究了有机金属α-（BEDT-TTF）_2TlHg（SCN）_4和α-（BEDT-TTF）_2KHg（SCN）_4单晶对毫米波辐射的磁吸收。实验揭示了两个主要贡献的磁吸收谱。第一种被解释为二维载流子的回旋共振，其特征在于宽线（线宽/磁场ΔB/B = 0.5-1）。除了表现出回旋质量m c = 2.8 m 0的共振外，还有两条线对应于范围为m c =（1-1.5）m 0和m c =（0.5-0.8）m 0的频率依赖性回旋质量。这种频率依赖性被认为是多体效应的结果。对磁吸收的第二个贡献是由一系列窄线形成的，其ΔB/B为0.03-0.1，振幅比被解释为回旋共振的特征小5-10倍。这些窄线归因于由于反铁磁共振和导电电子自旋共振（ESR）的模式的叠加。反铁磁共振的特征特性是存在频率随磁场增加而降低的模式。归因于ESR的磁吸收结构由一个相对较宽的最大值组成，在该最大值上叠加了一个急剧下降。这种行为被认为类似于在经历ESR的薄金属膜中观察到的共振透明性。
The magnetoabsorption of millimeter-wave radiation by single crystals of the organic metals α-(BEDT-TTF) 2 TlHg (SCN) 4 and α-(BEDT-TTF) 2 KHg (SCN) 4 has been studied in the frequency range 30–120 GHz. The experiments reveal two dominant contributions to the magnetoabsorption spectra. The first is interpreted as the cyclotron resonance of two-dimensional carriers, and is characterized by broad lines (linewidth/magnetic field ΔB/B∼ 0.5–1). In addition to a resonance exhibiting a cyclotron mass m c∼ 2.8 m 0, there are two further lines corresponding to frequency-dependent cyclotron masses in the ranges m c∼(1–1.5) m 0 and m c∼(0.5–0.8) m 0. This frequency dependence is believed to result from many-body effects. The second contribution to the magnetoabsorption is formed by a series of narrow lines with ΔB/B∼ 0.03–0.1 and amplitudes 5–10 times smaller than the features interpreted as cyclotron resonances. These narrow lines are attributed to a superposition of modes due to antiferromagnetic resonance and conduction-electron-spin resonance (ESR). The feature characteristic of antiferromagnetic resonance is the presence of a mode with a frequency that decreases with increasing magnetic field. The magnetoabsorption structure attributed to ESR consists of a relatively broad maximum upon which a sharp dip is superimposed. This behavior is believed to be analogous to the resonant transparency observed in thin metallic films undergoing ESR.© 1996 The American Physical Society.