Vortex liquid crystals in anisotropic type II superconductors.
Vortex liquid crystals in anisotropic type II superconductors.
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DOI：
10.1103/physrevlett.90.087001
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发表时间：
2002-09
影响因子：
8.6
通讯作者：
E. Carlson;A. H. Castro Neto;D. Campbell
中科院分区：
文献类型：
--
作者：
E. Carlson;A. H. Castro Neto;D. Campbell
在中等磁场下的各向同性II型超导体中，涡旋晶格熔化发生向正常态的转变。在某些各向异性的情况下，涡旋获得拉长的横截面和相互作用。各向异性、相互作用的成分组成的体系通常表现为液晶相。我们研究了具有各向异性超流刚度的均匀II型超导体在高温和磁场下从涡旋晶格到涡旋近晶再到涡旋向列相的两步熔化的可能性。我们发现，在没有本征钉扎的情况下，有序相的涨落有利于近晶-A的不稳定性。
In an isotropic type II superconductor in a moderate magnetic field, the transition to the normal state occurs by vortex lattice melting. In certain anisotropic cases, the vortices acquire elongated cross sections and interactions. Systems of anisotropic, interacting constituents generally exhibit liquid crystalline phases. We examine the possibility of a two step melting in homogeneous type II superconductors with anisotropic superfluid stiffness from a vortex lattice into first a vortex smectic and then a vortex nematic at high temperature and magnetic field. We find that fluctuations of the ordered phase favor an instability to an intermediate smectic-A in the absence of intrinsic pinning.