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First-order pre-melting transition of vortex lattices

机译:涡旋晶格的一阶预熔融转变

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摘要

Vortex lattices in the high-temperature superconductors undergo a first-order phase transition that has thus far been regarded as melting from a solid to a liquid. We point out an alternative possibility of a two-step process in which there is a first-order transition from an ordinary vortex lattice to a soft vortex solid followed by another first-order melting transition from the soft vortex solid to a vortex liquid. We focus on the first step. This pre-melting transition is induced by vacancy and interstitial vortex lines. We obtain good agreement with the experimental transition temperature against field, latent heat, and magnetization jumps for YBa2Cu3O7-delta and Bi2Sr2CaCu2O8. [References: 36]
机译:高温超导体中的涡旋晶格经历了一次相变,迄今为止,该相变被认为是从固体熔化为液体。我们指出了两步过程的另一种可能性,其中存在从普通涡旋晶格到软涡旋固体的一阶跃迁,然后是从软涡旋固体到涡旋液体的另一阶熔解跃迁。我们专注于第一步。这种预熔融转变是由空位和间隙涡流线引起的。我们获得了与YBa2Cu3O7-δ和Bi2Sr2CaCu2O8的磁场,潜热以及磁化跃迁相对的实验转变温度的良好一致性。 [参考:36]

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