DIRECT OBSERVATION OF MELTING OF THE VORTEX SOLID IN BI2SR2CACU2O8+DELTA SINGLE CRYSTALS
DIRECT OBSERVATION OF MELTING OF THE VORTEX SOLID IN BI2SR2CACU2O8+DELTA SINGLE CRYSTALS
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BI2SR2CACU2O8 Delta单晶中涡流固体熔化的直接观察
DOI：
10.1103/physrevlett.80.3610
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发表时间：
1998
影响因子：
8.6
通讯作者：
M. Henini
中科院分区：
文献类型：
--
作者：
A. Oral;J. Barnard;S. Bending;I. Kaya;S. Ooi;T. Tamegai;M. Henini
用扫描霍尔探针显微镜直接观察了Bi2Sr2CaCu2O8 + δ单晶的涡旋晶格熔化转变。在熔化线以下，系统稳定在一个相当有序的涡旋固体中，随着磁场的增加，由于不可压缩性效应，涡旋固体会发生明显的旋转。涡旋对比度在熔化线处突然且不连续地丧失，这与一阶转变一致。涡廓线似乎是强烈扩大的两维波动增长得更强的熔化线接近从下面，这表明熔化和去耦几乎是同时发生的。
A scanning Hall probe microscope has been used to directly observe the vortex lattice melting transition in Bi 2 Sr 2 CaCu 2 O 8+ δ single crystals. Below the melting line, the system settles into a fairly well-ordered vortex solid which undergoes pronounced rotations as the field is increased due to incommensurability effects. Vortex contrast is lost abruptly and discontinuously at the melting line consistent with a first order transition. Vortex profiles appear to be strongly broadened by two-dimensional fluctuations which grow much stronger as the melting line is approached from below, suggesting that melting and decoupling are almost simultaneous.