KINK WALLS AND CRITICAL-BEHAVIOR OF MAGNETIZATION NEAR THE LOCK-IN TRANSITION IN LAYERED SUPERCONDUCTORS
KINK WALLS AND CRITICAL-BEHAVIOR OF MAGNETIZATION NEAR THE LOCK-IN TRANSITION IN LAYERED SUPERCONDUCTORS
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DOI：
10.1103/physrevb.48.1180
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发表时间：
1993-07-01
影响因子：
3.7
通讯作者：
KOSHELEV, AE
中科院分区：
文献类型：
--
作者：
KOSHELEV, AE
我们考虑层状超导体在与层成很小夹角的磁场中的行为。垂直于各层的场分量的穿透是相变(锁定转变)的结果。精确地计算了锁相的边界。我们认为横向场的穿透是通过形成分离的扭结壁来实现的。壁上的场结构和磁化行为基本上取决于沿B(X)层的场值。在小B(X)处，扭结壁由分离的磁通管组成。每根管子包含的通量取决于B(X)并且小于一个通量量。在较大的B(X)处，这些管子重叠并形成磁通壁。详细研究了相变附近的磁化行为。在扭结壁之间的大间隔时，它们以指数形式相互作用，并且它们的浓度在锁定场上方的狭窄区域急剧增加。这导致在磁化强度的场依赖关系中出现一个微小的峰值，这可以用来指示锁定转变。
We consider the behavior of a layered superconductor in a magnetic field applied at very small angles with respect to the layers. The penetration of the field component perpendicular to the layers occurs as a result of the phase transition (lock-in transition). The boundary of the locked phase is calculated exactly. We argue that the penetration of the transversal field occurs by the formation of separated kink walls. The structure of field in the wall and the behavior of magnetization depend essentially upon the value of the field along layers B(x). At small B(x) a kink wall is composed of separated magnetic flux tubes. Each tube contains flux that depends upon B(x) and smaller than a flux quantum. At large B(x) these tubes overlap and form a magnetic flux wall. The behavior of the magnetization near the transition is studied in detail. At large separations between kink walls they interact exponentially and their concentration sharply increases in the narrow region above the lock-in field. This leads to the appearance of a tiny peak in the field dependence of the magnetization, which can be used to indicate the lock-in transition.