2007 Fiscal Year Final Research Report Summary
Computer simulation on vortex dynamics in type II superconductors
| Project/Area Number |
18540360
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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 |
Condensed matter physics II
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
XIAO Hu National Institute for Materials Science, WPI Center for Materials Nanoarchitectonics, Principal Investigator (90238428)
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| Co-Investigator(Kenkyū-buntansha) |
NONOMURA Yoshihiko National Institute for Materials Science, Computational Materials Science Center, Senior Researcher (30280936)
TANAKA Akihiro National Institute for Materials Science, Computational Materials Science Center, Senior Researcher (10354143)
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| Project Period (FY) |
2006 – 2007
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| Keywords | superconductivity vortex state / dynamics / depin transition / creep / scaling / computer simulation / glass state / Arrhenius law |
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| Research Abstract |
Using dynamical computer simulation we have investigated vortex matters in glass states. A genuine continuous depinning transition is observed at zero temperature, which also governs the low-temperature creep motion. With the notion of scaling, we evaluate in high accuracy critical exponents and scaling functions; we observe a non-Arrhenius creep motion for weak collective pinning where Bragg glass (BrG) is stabilized at equilibrium, while for strong pinning the well-known Arrhenius law is recovered. In both cases, a sharp crossover takes place between depinning and creep at low temperatures.
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