Critical state in a low-dimensional metal induced by strong magnetic fields

Critical state in a low-dimensional metal induced by strong magnetic fields
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强磁场引起的低维金属的临界状态

DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Tokumoto
M. Tokumoto
中科院分区：
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文献类型：
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作者：
Neil Harrison;L. Balicas;J. S. Brooks;M. Tokumoto

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我们给出了高磁场相α -(BEDT-TTF)2KHg(SCN)4电荷转移盐的磁输运和磁转矩测量结果，磁场延伸到33 T，温度低至27 mK。而高磁场相（在大于~ 23 T的场）预计，从理论上讲，要么是调制的电荷密度波相，要么是电荷/自旋密度波的混合体。在高磁场阶段，电阻率在~ 3 K以下急剧下降，在低温下呈近似指数型下降，而磁转矩表现出明显的磁滞效应。这种迟滞发生在广泛的磁场范围内，不仅与温度密切相关，而且具有一些由临界状态模型预测的行为特征，这些模型用于描述II型超导体在强磁场中固定涡流的现象。因此，α -(BEDT-TTF)2KHg(SCN)4在高磁场下的输运和磁性与II型超导体非常相似，而不是表现出密度波基态的通常行为。
We present the results of magnetotransport and magnetic torque measurements on the alpha-(BEDT-TTF)2KHg(SCN)4 charge-transfer salt within the high magnetic field phase, in magnetic fields extending to 33 T and temperatures as low as 27 mK. While the high magnetic field phase (at fields greater than ~ 23 T) is expected, on theoretical grounds, to be either a modulated charge-density wave phase or a charge/spin-density wave hybrid, the resistivity undergoes a dramatic drop below ~ 3 K within the high magnetic field phase, falling in an approximately exponential fashion at low temperatures, while the magnetic torque exhibits pronounced hysteresis effects. This hysteresis, which occurs over a broad range of fields, is both strongly temperature-dependent and has several of the behavioural characteristics predicted by critical-state models used to describe the pinning of vortices in type II superconductors in strong magnetic fields. Thus, rather than exhibiting the usual behaviour expected for a density wave ground state, both the transport and the magnetic properties of alpha-(BEDT-TTF)2KHg(SCN)4, at high magnetic fields, closely resembles those of a type II superconductor.