Vortex matter in superconductors
Vortex matter in superconductors
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DOI：
10.1063/1.1401182
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发表时间：
2001-09-01
影响因子：
0.8
通讯作者：
Pan, AV
中科院分区：
文献类型：
--
作者：
Pan, VM;Pan, AV
研究了不同取向的磁场下YBa_2Cu_3O_（7-δ）超导体双轴取向薄膜中Shubnikov相涡旋系综的行为。所使用的技术是记录的电流-电压特性的传输电流和谐振曲线和阻尼的机械振荡器在传输电流的通道。结果表明，与单晶不同，YBCO薄膜中涡旋系综的行为是由涡旋与线缺陷--边缘位错的相互作用决定的，边缘位错是赝晶外延生长过程中形成的，是晶格中的主要缺陷类型，其密度可达10（15）线/m（2）。YBCO薄膜中涡旋的有效钉扎和高临界电流密度（77 K时J（c）大于或等于3 × 10 ~（10）A/m ~（2））正是由于高密度的线缺陷所致。在YBCO薄膜中的涡旋物质的新的相态被发现，并在准静态和动力学研究，它们是由于与晶体缺陷的涡旋的相互作用，各种类型的无序的涡旋晶格的发病，和复杂的脱钉过程。提出了YBCO薄膜涡旋物质的H-T相图。(C)2001年美国物理学会。
The behavior of the ensemble of vortices in the Shubnikov phase in biaxially oriented films of the high-temperature superconductor YBa2Cu3O7-delta (YBCO) in an applied magnetic field is investigated for different orientations of the field. The techniques used are the recording of the current-voltage characteristics in the transport current and of resonance curves and damping of a mechanical oscillator during the passage of a transport current. It is shown that the behavior of the vortex ensemble in YBCO films, unlike the case of single crystals, is determined by the interaction of the vortices with linear defects-edge dislocations, which are formed during the pseudomorphic epitaxial growth and are the dominant type of defect of the crystal lattice, with a density reaching 10(15) lines/m(2). The effective pinning of the vortices and the high critical current density (J(c)greater than or equal to 3x10(10) A/m(2) at 77 K) in YBCO films are due precisely to the high density of linear defects. New phase states of the vortex matter in YBCO films are found and are investigated in quasistatics and dynamics; they are due to the interaction of the vortices with crystal defects, to the onset of various types of disordering of the vortex lattice, and to the complex depinning process. A proposed H-T phase diagram of the vortex matter for YBCO films is proposed. (C) 2001 American Institute of Physics.