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We find mode-locking steps in simulated force-velocity characteristics of external alternating-force (AF) driven colloids on a disordered substrate. Studies of mode-locking patterns in systems show that mode-locking steps are accompanied with the emergence of a dynamics phase: transverse solid phase. We also study the influence of temperature on the width of mode-locking steps. The mode-locked state is destroyed by thermal fluctuation and the width of mode-locking steps decreases rapidly with increasing temperature. In high velocity and low temperature regimes, due to the appearance of transverse solid phase and microscopically periodic velocity modulation, the step width changes little as temperature is varied. 相似文献
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本文报道了用La、Sr、Mn的环烷酸盐溶液 ,采用两次旋转覆盖的溶胶 凝胶方法 ,在LaA lO3( 10 0 )基底上合成了La0 .82 2 Sr0 .178MnxO3薄膜 .Mn含量x在 0 .94 4~ 1.196范围内 ,电阻率随着温度的变化关系 ,是从绝缘体向金属导电行为转变 ;对x =0 .9样品则表现为绝缘体 .对x=0 .94 4样品 ,当T >Tc 时 ,ρ∝exp(E/kT) ,说明载流子的迁移是以热激活方式进行的 ,热激活能为 2 1meV ;当T 相似文献
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(La2/3Ca1/3)O3低温下的电阻极小值行为 总被引:3,自引:0,他引:3
对B位替代的Mn氧化物(La2/3Ca1/3)O3样品在温度远低于居里温度时的电阻率随温度的变化行为进行了研究.发现未加磁场时,样品在低温下表现出电阻率极小行为,这一极小现象在外加磁场后被大为抑制.作者对此实验现象作了定量的理论与实验的比较,并给出了有关可能的机理. 相似文献
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