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首页> 外文期刊>Physica, C. Superconductivity and its applications >THERMAL FLUCTUATIONS IN D-WAVE LAYERED SUPERCONDUCTORS
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THERMAL FLUCTUATIONS IN D-WAVE LAYERED SUPERCONDUCTORS

机译:D波层状超导体的热波动

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We study the thermal fluctuations of anisotropic order parameters (OF) in layered superconductors. In particular, for copper oxides and a d-wave OP, we present some experimental consequences of fluctuations in the direction normal to the layers. It is shown that the c-axis penetration depth lambda(c) can have a ''disorder-like'' quadratic temperature dependence at low temperature. The fluctuations are analyzed in the framework of a Lawrence-Doniach model with an isotropic Fermi surface. Anisotropies pin the orientation of the OP to the crystallographic axes of the lattice. Then we study an extended t-J model that fits Fermi surface data of bilayers YBCO and BSCCO. This leads to a d-wave OP with two possible orientations and, including the thermal fluctuations, yields the announced temperature dependence of lambda(c). Furthermore a reservoir layer is introduced. It implies a finite density of states at the Fermi energy which is successfully compared to conductance and specific heat measurements. [References: 49]
机译:我们研究了层状超导体中各向异性阶数参数(OF)的热涨落。特别是对于氧化铜和d波OP,我们提出了垂直于层方向波动的实验结果。结果表明,在低温下,c轴穿透深度λ(c)可能具有“无序”的二次温度依赖性。在具有各向同性费米表面的Lawrence-Doniach模型的框架内分析了波动。各向异性将OP的方向固定在晶格的结晶轴上。然后,我们研究了扩展的t-J模型,该模型适合双层YBCO和BSCCO的费米表面数据。这会导致d波OP具有两个可能的方向,并且包括热波动在内,都会产生lambda(c)的温度依赖性。此外,引入储层。这意味着费米能量处的状态密度有限,可以成功地将其与电导和比热测量结果进行比较。 [参考:49]

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