Novel Studies of Vortex Matter and Peak Effect using In-Situ Neutron Scattering and AC Magnetization

利用原位中子散射和交流磁化研究涡旋物质和峰值效应

基本信息

  • 批准号:
    0102746
  • 负责人:
  • 金额:
    $ 27万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-07-01 至 2004-06-30
  • 项目状态:
    已结题

项目摘要

This individual investigator award is to a young professor for a study of vortex matter phases and phase transitions related to the peak effect in type-II superconductors, using in situ neutron scattering and ac magnetization measurements. In spite of the technological importance of type-II superconductors, the vortex matter phases are poorly understood. For many years, it was thought that a genuine order-disorder (melting) phase transition cannot occur in vortex matter systems due to the destructive effects of random pinning. Recently it was proposed that a topologically ordered vortex solid phase (Bragg glass) could exist in weakly disordered type-II superconductors. The melting (disordering) of the Bragg glass phase has been suggested as the origin of the well known but poorly understood peak effect anomaly seen in many type-II superconductors. There is preliminary experimental evidence suggesting that the peak effect is a genuine order-disorder phase transition in the superconducting vortex matter. This project will use in situ small angle neutron scattering to determine the vortex matter phase diagram in a classic type-II superconductor, Nb. The effects of disorder on the supercooling and superheating of vortex matter will be investigated. This project will also explore a possible application of neutron spin echo technique for studying the metastable vortex phases. These studies will establish a basic understanding of the magnetic properties of type-II superconductors. The graduate and undergraduate students participating in this project will have the opportunity to work at the Center for High-Resolution Neutron Scattering at the NIST and at the Institut Laue Langevin in Grenoble, France with researchers from around the world. This should prepare the students for future careers in academia, industry, or government.%%%Vortices in type-II superconductors form a condensed matter system of technological and scientific interests. Superconductors are of technological interest because they are able to carry high electrical currents without loss due to resistance. The current-carrying capability of a superconductor is determined by a subtle competition between the vortex-vortex interactions, the random pinning (vortex-pin interactions), and thermal fluctuations. In spite of the technological importance of type-II superconductors, the vortex matter phases are poorly understood. This individual investigator award is to a young professor who will study the physics of vortex matter using in situ neutron scattering and ac magnetization measurements. These studies will establish a basic understanding of the magnetic properties of type-II superconductors. The graduate and undergraduate students participating in this project will have the opportunity to work at the Center for High-Resolution Neutron Scattering at the NIST and at the Institut Laue Langevin in Grenoble, France with researchers from around the world. This should prepare the students for future careers in academia, industry, or government.***
这一个人研究人员奖授予一位年轻教授,他使用原位中子散射和交流磁化测量对第二类超导体中与峰值效应相关的涡旋物质相和相变进行了研究。尽管第二类超导体在技术上很重要,但人们对涡旋物质相的了解很少。多年来,人们一直认为,由于随机钉扎的破坏作用,涡旋物质系统不可能发生真正的有序-无序(熔化)相变。最近有人提出在弱无序的第II类超导体中可能存在一种拓扑有序的涡旋固相(Bragg玻璃)。布拉格玻璃相的熔化(无序)被认为是许多第二类超导体中出现的众所周知但鲜为人知的峰效应反常的根源。有初步的实验证据表明,峰值效应是超导涡旋物质中真正的有序-无序相变。这个项目将使用原位小角中子散射来确定经典的II型超导体Nb中的涡旋物质相图。我们将研究无序对涡旋物质过冷和过热的影响。该项目还将探索利用中子自旋回波技术研究亚稳态涡旋相的可能性。这些研究将建立对第二类超导体磁性的基本理解。参与该项目的研究生和本科生将有机会与来自世界各地的研究人员一起在NIST的高分辨率中子散射中心和法国格勒诺布尔的劳埃朗之万研究所工作。这应该会为学生将来在学术界、工业界或政府的职业生涯做好准备。第二类超导体中的%涡旋形成了一个具有技术和科学意义的凝聚态系统。超导体之所以在技术上引起人们的兴趣,是因为它们能够携带大电流,而不会因电阻而产生损耗。超导体的载流能力由涡旋-涡旋相互作用、随机钉扎(涡旋-钉扎相互作用)和热涨落之间的微妙竞争决定。尽管第二类超导体在技术上很重要,但人们对涡旋物质相的了解很少。这一个人研究人员奖授予一位年轻的教授,他将使用原位中子散射和交流磁化测量来研究涡旋物质的物理。这些研究将建立对第二类超导体磁性的基本理解。参与该项目的研究生和本科生将有机会与来自世界各地的研究人员一起在NIST的高分辨率中子散射中心和法国格勒诺布尔的劳埃朗之万研究所工作。这应该会让学生为未来在学术界、工业界或政府的职业生涯做好准备。

项目成果

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Xinsheng Ling其他文献

Translocation Studies of Single Strand-DNA Oligomer Complexes with ds-DNA Markers Using Solid-State Nanopores
  • DOI:
    10.1016/j.bpj.2008.12.3855
  • 发表时间:
    2009-02-01
  • 期刊:
  • 影响因子:
  • 作者:
    Venkat Balagurusamy;Paul Weinger;Sungcheol Kim;Xinsheng Ling
  • 通讯作者:
    Xinsheng Ling

Xinsheng Ling的其他文献

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{{ truncateString('Xinsheng Ling', 18)}}的其他基金

Thermally Activated Dynamics in 2D Colloidal Glasses and Crystals
二维胶体玻璃和晶体中的热激活动力学
  • 批准号:
    2203380
  • 财政年份:
    2022
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
Statics and Dynamics of 1D and 2D Colloidal Lattices with Random Pinning
具有随机钉扎的一维和二维胶体晶格的静力学和动力学
  • 批准号:
    1005705
  • 财政年份:
    2010
  • 资助金额:
    $ 27万
  • 项目类别:
    Continuing Grant
Investigation of Vortex Matter Phase Transitions in Type-II Superconductors using Small Angle Neutron Scattering and Complementary Techniques
使用小角中子散射和互补技术研究 II 型超导体中的涡旋物质相变
  • 批准号:
    0406626
  • 财政年份:
    2004
  • 资助金额:
    $ 27万
  • 项目类别:
    Continuing Grant
NIRT: DNA Sequencing and Translocation Studies using Electrically-Addressable Nanopore Arrays
NIRT:使用电可寻址纳米孔阵列进行 DNA 测序和易位研究
  • 批准号:
    0403891
  • 财政年份:
    2004
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
NER: DNA Sequence Detection Using Novel Solid-State and Soft Nanopores
NER:使用新型固态和软纳米孔进行 DNA 序列检测
  • 批准号:
    0304325
  • 财政年份:
    2003
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
Acquisition of a Workhorse Electron Beam Lithography System for Microstructured Materials and Devices Research
采购用于微结构材料和器件研究的主力电子束光刻系统
  • 批准号:
    0079628
  • 财政年份:
    2000
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
SGER: In-Situ Measurements of Small Angle Neutron Scattering and AC Magnetic Susceptibility of Vortex Matter
SGER:涡旋物质小角中子散射和交流磁化率的原位测量
  • 批准号:
    0075838
  • 财政年份:
    2000
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
Novel Studies of Topological Order and Pinning Effects in Colloidal Crystals
胶体晶体拓扑序和钉扎效应的新研究
  • 批准号:
    9804083
  • 财政年份:
    1998
  • 资助金额:
    $ 27万
  • 项目类别:
    Continuing Grant

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利用光梳光谱研究光涡旋超材料
  • 批准号:
    21H01840
  • 财政年份:
    2021
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    2017
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纳米结构薄膜光热效应产生马兰戈尼涡流的研究
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    15H06310
  • 财政年份:
    2015
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Studies of magnetic imaging using electron vortex beams
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  • 批准号:
    26286014
  • 财政年份:
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  • 资助金额:
    $ 27万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
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电子涡流束的产生及其与手性材料相互作用的研究
  • 批准号:
    23241036
  • 财政年份:
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NMR Studies of Magnetic Vortex Cores of Type-II Superconductors
II型超导体磁涡核的核磁共振研究
  • 批准号:
    22540353
  • 财政年份:
    2010
  • 资助金额:
    $ 27万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Experimental Studies on Compressible Vortex Rings and their Interactions with Stationary and Moving Flat Surfaces
可压缩涡环及其与静止和运动平面相互作用的实验研究
  • 批准号:
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  • 财政年份:
    2007
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    Research Grant
Turbulence and vortex studies
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  • 批准号:
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Turbulence and vortex studies
湍流和涡流研究
  • 批准号:
    1157-2002
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    2005
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    $ 27万
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    Discovery Grants Program - Individual
Turbulence and vortex studies
湍流和涡流研究
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    1157-2002
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    2004
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