Wei Wenqi, Yang Ming, Jin Shimin, Zhu Haipeng, Wang Junfeng, Han Xiaotao
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
Rev Sci Instrum. 2022 Aug 1;93(8):085102. doi: 10.1063/5.0097702.
Investigation of the non-ohmic transport behaviors under high magnetic fields can provide a new way to explore novel field-induced phenomena. We present the current-voltage measurements under high magnetic fields based on the flat-top pulsed magnetic field system. Two different measurement strategies were compared, given that the excitation current swept continuously or increased by a series of pulses. For the short duration of the flat-top pulsed field, the continuous current method was adopted and well optimized to reduce the Joule heating and achieve the quasi-static measurements. Finally, the non-ohmic behaviors of a quasi-one-dimensional charge density wave LiMoO were successfully studied under the magnetic field up to 30 T at 4.2 K, which was the first current-voltage measurements carried out in pulsed magnetic fields.
研究高磁场下的非欧姆输运行为可为探索新型场致现象提供新途径。我们基于平顶脉冲磁场系统展示了高磁场下的电流-电压测量。鉴于激发电流是连续扫描还是通过一系列脉冲增加，比较了两种不同的测量策略。对于平顶脉冲场的短持续时间，采用了连续电流法并进行了优化，以减少焦耳热并实现准静态测量。最终，在4.2K温度下高达30T的磁场中成功研究了准一维电荷密度波LiMoO的非欧姆行为，这是在脉冲磁场中进行的首次电流-电压测量。
