1999 Fiscal Year Final Research Report Summary
Ordering and Dynamics of Vortex Matter
| Project/Area Number |
10640367
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物性一般(含基礎論)
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| Research Institution | Osaka University (1999)
Kyoto Institute of Technology (1998) |
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Principal Investigator |
KAWAMURA Hikaru Graduate School of Science, Osaka University, Professor, 大学院・理学系研究科, 教授 (30153018)
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| Project Period (FY) |
1998 – 1999
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| Keywords | vortex / vortex line / High-Tc superconductor / phase diagram / screening / chiral glass / vortcx glass / Monte Carlo simulation |
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| Research Abstract |
Due to the enhanced effect of fluctuations, the problem of the phase diagram of high-TィイD2cィエD2 superconductors in applied magnetic fields is highly nontrivial and has attracted much recent interest. For random type-II superconductors with point disorder, possible existence of an equilibrium thermodynamic phase called the vortex-glass phase, where the vortex was pinned on long length scale by randomly distributed point-pinning centers, was proposed. In the project, stability of the three-dimensional vortex-glass order in random type-II superconductors with point disorder is investigated by equilibrium Monte Carlo simulations based on a lattice XY model with a uniform field threading the system. It is found that the vortex-glass order, which stably exists in the absence of screening, is destroyed by the screening effect, corroborating the previous finding based on the spatially isotropic gauge-glass model. Estimated critical exponents, however, deviate considerably from the values reported for the gauge-glass model.
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Research Products
(12 results)
