首页> 外文OA文献 >EXPERIMENTAL STUDIES OF QUANTUM OSCILLATIONS IN THE TRANSVERSE MAGNETORESISTANCE OF SINGLE-CRYSTALLINE, ULTRAPURE MAGNESIUM: NON-OHMIC EFFECTS.
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EXPERIMENTAL STUDIES OF QUANTUM OSCILLATIONS IN THE TRANSVERSE MAGNETORESISTANCE OF SINGLE-CRYSTALLINE, ULTRAPURE MAGNESIUM: NON-OHMIC EFFECTS.

机译:单晶,超纯镁的横向磁致电阻中量子振动的实验研究:非欧姆效应。

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摘要

We report here the observation of non-ohmic behavior in the dominant oscillatory component (the cigar component) of ρ('H) in ultrapure magnesium when the magnetic field, 'H, is parallel to [0001] and the current density, 'J, lies in the basal plane. In order to study this new phenomenon systematically, we had to overcome two experimental problems. The first was the design of an experimental probe which could reproducibly control, at low temperatures, the contact resistance at one of the points where current is injected into the sample without disturbing the sample's orientation with respect to 'H. Special micromanipulators, controlled by helium gas pressure, were designed into the probe for this purpose. The second problem was the construction of a detector which had the sensitivity to measure small signals from the magnesium samples in an effort to investigate the low current regime where the oscillations appear to satisfy Ohm's Law. A superconducting chopper amplifier was built which had the sensitivity to measure 10⁻¹¹ volt signals. We present evidence which directly relates this non-ohmic behavior to the long-range influence of a relatively large contact resistance at a point where current is injected into the sample. Data are presented which indicate that when this non-ohmic behavior is present, the corresponding oscillation amplitudes are proportional to the contact resistance. Measurements are also presented which show that the effects of this local current injection are so nonlocal that they extend over distances which are comparable to the dimensions of the sample.
机译:我们在这里报告当磁场'H平行于[0001]和电流密度'J时在超纯镁中ρ('H)的主要振荡成分(雪茄成分)中的非欧姆行为的观察结果,位于基底平面。为了系统地研究这种新现象,我们必须克服两个实验问题。第一个是实验探针的设计,该探针可以在低温下可重现地控制在向样品中注入电流的点之一处的接触电阻,而不会干扰样品相对于'H'的方向。为此,在探头中设计了受氦气压力控制的特殊微操纵器。第二个问题是构造一种检测器,该检测器具有能够测量镁样品中小信号的灵敏度,以研究振荡似乎满足欧姆定律的低电流状态。建造了一个超导斩波放大器,它具有测量10 11伏信号的灵敏度。我们提供的证据将这种非欧姆行为与在向样品中注入电流的点上较大接触电阻的长期影响直接相关。呈现的数据表明,当出现这种非欧姆行为时,相应的振荡幅度与接触电阻成比例。还提供了测量结果,这些测量结果表明这种局部电流注入的影响是非局部的,以至于它们延伸的距离与样品的尺寸相当。

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  • 作者

    WHITTEMORE THOMAS EDWARD.;

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  • 年度 1986
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  • 原文格式 PDF
  • 正文语种 en
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