Cyclotron resonance measurements of BEDT-TTF salts above the kink field under high field

1.研制并安装了新型的3 kV 100 kJ电容器电源; 2.研制了Cu-Ag丝脉冲磁体，并利用新型的3 kV 100 kJ电容器组实现了36 T的低温超导磁体; 3.研制了一种新型的低温超导磁体，并在低温下进行了高场ESR测量。(2)利用这种新型低温恒温器，我们在1.8K下对二维有机导体α-（BEDT-TTF）_2KHg（SCN）_4进行了回旋共振测量，确定了扭结场下SDW相的四个有效质量：0.46m_e（CRI），0.96m_e（CR_2），1.30m_e（CR_3），1.71m_e（CR_4）。(3)我们成功地观察到回旋共振CR_3在1.8K的高场阶段以上的扭结场使用频率466-503 GHz。由于CR 3与α轨道的共振CR2不同，这一结果表明在高温相和高场相之间存在相边界。（BEDT-TTF）_2I_3的费米面比α-（BEDT-TTF）_2 KHg（SCN）_4，用矢量网络分析仪测量了样品的温度和模式耦合关系，确定了样品的有效质量分别为1.03m_e和2.14m_e。e.5我们用矢量网络分析仪观测了二维有机导体（BEDT-TTF）_2Br（DIA）在0.5K以下的回旋共振，观测到了5阶共振。观测到的共振可能是Hill等人提出的周期轨道共振，详细的分析正在进行中。

1 New power supply for the 3kV 100kJ capacitors was made and installed.2 We made a Cu-Ag wire pulsed magnet and achieved 36T using the new 3kV 100kJ capacitor bank.3(1) We made a new cryostat equiped with the 36T Cu-Ag pulsed magnet and made several high field ESR measurements at low temperature.(2) Using this new cryostat, we made cyclotron resonance measurements of two dimensional organic conductor α-(BEDT-TTF) _2 KHg (SCN) _4 at 1.8K.We determined 4 effective masses 0.46m_e (CRI), 0.96m_e (CR2), 1.30m_e (CR3), 1.71m_e (CR4) in the SDW phase below the kink field.(3) We succeeded in observing the cyclotron resonance CR3 at 1.8K in the high field phase above the kink field using the frequencies 466-503 GHz. As CR3 is different from the resonance CR2 from the α orbit, this result suggests that there exists a phase boundary between the high temperature phase and the high field phase.4 We observed the cyclotron resonances of θ-(BEDT-TTF) _2I_3, which has much simpler Fermi surface than α-(BEDT-TTF) _2 KHg (SCN) _4, by vector network analyzer down to 0.5K.We measured the temperature and the mode coupling dependences and determined the effective masses as 1.03m_e and 2.14m_e.5 We observed the cyclotron resonances of two dimensional or ganic conductor (BEDT-TTF) 2Br (DIA) by vector network analyzer down to 0.5 K.The resonances were observed up to 5th order. Observed resonances may be the periodic orbit resonance proposed by Hill et al. and the detailed analyses are on the way.