Phase transition and size effect in Josephson vortex state
约瑟夫森涡旋态的相变和尺寸效应
基本信息
- 批准号:14340098
- 负责人:
- 金额:$ 9.66万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is inevitable to make measurement on high quality single crystal samples in order to understand the vortex state in high temperature superconductors. In reality, it is, however, not possible to have perfect samples, which completely exclude the effect of pinning. To make pinning flee sample as much as possible, one should avoid at least the surface barriers, which mask and distort the bulk properties. This sort of experiment has not been done before.The most characteristic properties such as the quasi two-dimensional behavior of the superconducting state in high temperature superconductors affect the superconducting state very much in strong magnetic fields. In strongly anisotropic superconductor Bi_2Sr_2CaCu_2O_<8+δ>, the effect is remarkable. Hence, the phase diagram of the vortex state in high temperature superconductors is very different from that of the conventional ones. Furthermore, when magnetic field is applied parallel to the two-dimensional plane, Josephson vortices are f … More ormed and variety of vortex states is expected as functions of temperature, magnetic field, angle of magnetic field with respect to the sample, etc. When magnetic field is tilted a little bit, the crossing lattice will appear and the phenomena become more complicated due to additional pinning effect of pancake vortices.In this study, to avoid the surface pinning the Corbino disk method is used for the electrical resistivity measurement and the miniature coil method is used for the ac magnetic response measurement As a result we could explore the vortex phase diagram of the Bi_2Sr_2CaCu_2O<8+δ>, from pancake to crossing lattice state, from crossing lattice to Josephson state, from solid to liquid state in the whole angle region. The characteristic features among them, are as follows :1. There are two distinctly different phases in the Josephson vortex state with respect to the magnetic field strength, and this transition seems to possibly be the second order phase transition.2. The peak effect is found in the crossing lattice state just prior to the phase transition.3. There are two vortex liquid phases. These are induced phase due to different pinning effects in the diferent regime of magnetic field4. The vortex dynamics in the Josephson vortex state in high fields is entirely different from the vortex pancake liquid phase.These results contributed to the understanding ofthe Josephson vortex state as well as solid vortex phase in high temperature superconductors. Less
为了了解高温超导体中的涡旋态,对高质量的单晶样品进行测量是不可避免的。然而,实际上,不可能有完全排除钉扎效应的完美样本。为了使钉扎尽可能地逃离样品,至少应该避免表面障碍,这掩盖和扭曲的整体性质。高温超导体中超导态的准二维行为等最具特征的性质对强磁场下的超导态有很大的影响。在强各向异性超导体Bi_2Sr_2CaCu_2O_(8+δ)中,这种效应是显著的。因此,高温超导体中涡旋态的相图与常规超导体中涡旋态的相图有很大的不同。此外,当磁场平行于二维平面施加时,约瑟夫森涡旋是f ...更多信息 在本研究中,由于饼状涡旋的附加钉扎效应,当磁场稍微倾斜时,会出现交叉晶格,并且这种现象变得更加复杂。为了避免表面钉扎,电阻率测量采用了Corbino圆盘法,交流磁响应测量采用了微型线圈法,从而可以探测到涡旋相位Bi_2Sr_2CaCu_2O<8+δ>从饼状到交叉晶格态、从交叉晶格态到约瑟夫森态、从固态到液态的全角度图。其中,有以下特点:1.在约瑟夫森涡旋态中存在两个相对于磁场强度明显不同的相,这种相变可能是二级相变.峰值效应出现在相变前的交叉晶格态.存在两个涡旋液相。这些是由于不同的钉扎效应在不同的磁场制度4的诱导阶段。高场下Josephson涡旋态的涡旋动力学与涡旋饼液相完全不同,这些结果有助于理解高温超导体中的Josephson涡旋态以及固态涡旋相。少
项目成果
期刊论文数量(96)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Observation of paramagnetic supercurrent in mesoscopic superconducting rings and discusing multiple-tunnel-junction method
介观超导环中顺磁超电流的观测及多隧道结方法的探讨
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:H.Toki;K.Ikeda;S.Sugimoto;A.Kanda
- 通讯作者:A.Kanda
Y.Hata, et al.: "Vortex Imaging of Magnetic Superconductor HoNi_2B_2C by Scanning SQUID Microscopy"Physica C. 378-381. 420-423 (2002)
Y.Hata 等人:“通过扫描 SQUID 显微镜对磁超导体 HoNi_2B_2C 进行涡旋成像”Physica C. 378-381。
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- 影响因子:0
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S.E.Savel'ev, et al.: "Elasticity of Combined Pancake and Josephson Vortex Lattice"Physica C. 378-381. 580-583 (2002)
S.E.Savelev 等人:“组合薄饼和约瑟夫森涡旋晶格的弹性”Physica C. 378-381。
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- 影响因子:0
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J.Mirkovic, et al.: "Anisotropy of Vortex-Liquid and Vortex-Solid Phases in Single Crystals of Bi_2Sr_2CaCu_2O_<8+δ> : Violation of the Scaling Law"Physical Review B. 66. 132505-132508 (2002)
J.Mirkovic 等人:“Bi_2Sr_2CaCu_2O_<8+δ> 单晶中涡流液相和涡流固相的各向异性:违反缩放定律”物理评论 B. 66. 132505-132508 (2002)
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- 影响因子:0
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J.Mirkovic, et al.: "Vortex Phases in Single Crystals of Bi_2Sr_2CaCu_2O_<8+δ> near ab-Plane studied by c-Axis and In-Plane Resistivity Measurements"Physica C. 388-389. 757-758 (2003)
J.Mirkovic 等人:“通过 c 轴和面内电阻率测量研究近 ab 平面的 Bi_2Sr_2CaCu_2O_<8+δ> 单晶中的涡旋相”Physica C. 388-389 (2003)。
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KADOWAKI Kazuo其他文献
KADOWAKI Kazuo的其他文献
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{{ truncateString('KADOWAKI Kazuo', 18)}}的其他基金
THz Wave Generation by Means of Superconducting Intrinsic Josephson Junctions and Its Application
超导本征约瑟夫森结产生太赫兹波及其应用
- 批准号:
18204031 - 财政年份:2006
- 资助金额:
$ 9.66万 - 项目类别:
Grant-in-Aid for Scientific Research (A)