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

1.研制并安装了新的3KV100kJ电容器电源。2、制作了一台铜银丝脉冲磁体，并用该电容组实现了36T的功率输出。3(1)研制了一台与36T脉冲磁体配套的新型低温恒温器，并进行了多次低温高场电子自旋共振测量。(2)利用该低温恒温器，对二维有机导体α-(BEDT-TTf)_2KHg(SCN)_4进行了1.8K的回旋共振测量。测量了4种有效质量：0.46m_e(Cri)，0.96m_e(Cr2)，1.30Me(Cr3)，1.71Me(Cr4).(3)在466-503 GHz频率下，我们成功地观测到了1.8K的强场相回旋共振CR3。由于Cr3不同于来自α轨道的共振Cr2，这一结果表明高温相和高场相之间存在相界。4我们观察到了θ-(BEDT-TTf)_2I_3的回旋共振，它的费米面比α-(BEDT-TTf)_2KHg(SCN)_4简单得多，用矢量网络分析仪测量了低至0.5K的温度和模耦合关系，测得有效质量分别为1.03M_e和2.14M_E。5用矢量网络分析仪观测到了低至0.5K的二维或有机导体(BEDT-TTF)2BrDIA的回旋共振。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.