VORTEX-CHAIN STATE IN BI2SR2CACU2O8+DELTA - EXPERIMENTAL-EVIDENCE FOR COEXISTENCE OF 2 VORTEX ORIENTATIONS
VORTEX-CHAIN STATE IN BI2SR2CACU2O8+DELTA - EXPERIMENTAL-EVIDENCE FOR COEXISTENCE OF 2 VORTEX ORIENTATIONS
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DOI：
10.1103/physrevb.51.3765
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发表时间：
1995-02-01
影响因子：
3.7
通讯作者：
PAUL, DM
中科院分区：
文献类型：
--
作者：
GRIGORIEVA, IV;STEEDS, JW;PAUL, DM
用Bitter装饰技术对高各向异性Bi 2Sr 2CaCu 2 O 8+ x（BSCCO）单晶在倾斜磁场中出现的混合涡旋链-涡旋晶格相进行了详细的研究.从该结构中的涡旋周期的场和倾斜角依赖性，我们得出结论，BSCCO中的涡旋链是定性不同的适度各向异性和充分研究的YBa 2Cu 3 Ox。特别是，链内涡周期是独立的倾斜角φ为一个给定的垂直分量的字段，而在干预磁通线晶格（FLL）的涡周期显示了最大值vs φ。此外，当cphi> 70时，FLL涡的数目与总涡数的比率迅速减小。从这些依赖关系出发，我们表明，所观察到的混合涡相可以解释一致的链和FLL涡具有不同的取向，既不平行于所施加的领域，建议最近的理论计算。
A detailed study is reported by the Bitter decoration technique of the mixed vortex chain–vortex lattice phase found in tilted magnetic fields in single crystals of the highly anisotropic Bi 2 Sr 2 CaCu 2 O 8+ x (BSCCO). From the field and tilt-angle dependencies of the vortex periods in this structure we conclude that the vortex chains in BSCCO are qualitatively different from those in the moderately anisotropic and well-studied YBa 2 Cu 3 O x. In particular, the intrachain vortex period is independent of the tilt angle cphi for a given perpendicular component of the field while the vortex period in the intervening flux-line lattice (FLL) shows a maximum vs cphi. In addition, the ratio of the number of the FLL vortices to the total number of vortices decreases rapidly for cphi> 70. Proceeding from these dependencies, we show that the observed mixed vortex phase can be explained consistently by the chain and the FLL vortices having different orientations, neither parallel to the applied field, as suggested by recent theoretical calculations.