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首页> 外文期刊>Physica, C. Superconductivity and its applications >Vortex phases in YBa2Cu3Oy (y=6.5) for B parallel to CuO: impact of regular and random pinning arrays
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Vortex phases in YBa2Cu3Oy (y=6.5) for B parallel to CuO: impact of regular and random pinning arrays

机译:B与CuO平行的B的YBa2Cu3Oy(y = 6.5)中的涡旋相:规则和随机钉扎阵列的影响

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Using high angular resolution (up to 10(-4) degree) resistive measurements we studied a YBa2Cu3O6.5 single crystal for the magnetic field (B < 28 T) direction closely parallel (within the lock-in angle of 0.3degrees) to the crystal CuO-planes. Our data show that the vortices become confined between the CuO-planes below a well-defined temperature T-cf. Using a pseudo-flux transformer geometry for electrical transport measurements we demonstrate directly a smectic-like vortex movement for temperatures below T-S. Our measurements reveal a rich phase diagram for magnetic field orientation Bparallel toCuO, originating from the inter-play between pinning by the CuO-planes, point-like disorder from oxygen vacancies and temperature fluctuations. Commensurability between the inter-vortex distance and the CuO-layer period causes a pronounced oscillatory behaviour dominated by in-plane vortex movement. (C) 2004 Elsevier B.V. All rights reserved.
机译:使用高角度分辨率(最高10(-4)度)电阻测量,我们研究了YBa2Cu3O6.5单晶,其磁场方向(B <28 T)紧密平行(在0.3度的锁定角度内)晶体CuO平面。我们的数据表明,涡流被限制在低于明确定义的温度T-cf的CuO平面之间。使用伪磁通变压器几何结构进行电传输测量,我们直接证明了温度低于T-S时类似近晶状涡旋运动。我们的测量揭示了平行于CuO的磁场方向B的丰富相图,该相图源自CuO平面的钉扎,氧空位和温度波动引起的点状无序之间的相互作用。涡旋间距离与CuO层周期之间的可比性会引起明显的振荡行为,而这种振荡行为主要由平面内的涡旋运动控制。 (C)2004 Elsevier B.V.保留所有权利。

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