物理科学与技术学院学术报告:Thermal hysteresis and dynamic history effects in vortex matter

学术报告:Thermal hysteresis and dynamic history effects in vortex matter 

报告人:Gabriela Pasquini  教授,Universidad de Buenos Aires, FCEyN, Departamento de Física, Argentina.

报告题目:Thermal hysteresis and dynamic history effects in vortex matter

报告时间:816日,周四,下午2

报告地点:红楼东侧小楼204,原发展办

报告摘要:In a variety of complex systems, among witch vortex matter is a prototype, glassy behavior and metastable configurations give rise to striking history effects closely connected with a rich dynamics where plasticity plays a key role. Superconducting materials with randomly distributed weak pinning centers are an ideal playground for research. In this talk I will present a whole picture built during the last decade by our group to explain thermal and dynamic history effects observed in vortex matter. The key results were obtained by performing joint AC susceptibility measurements and small angle neutron diffraction experiments in clean NbSe2 single crystals. I will review one of our main result that shows direct evidence of the existence of a region in the phase diagram, where the application of shaking AC fields gives rise to bulk vortex lattice (VL) configurations with intermediate dislocation densities, correlated with intermediate effective pinning. I will also show that thermal and dynamic history effects are revealed as qualitatively different, and discuss how the thermal hysteresis can be theoretically explained in term of the strong pinning theory.

报告人简介:Prof. Gabriela Pasquini obtained her degree in physics and her PhD at Buenos Aires Universtiy, Argentina in 1998, working in AC vortex dynamics in the presence of columnar defects. After a PosDoctoral stay in Tor Vergata University, Rome, she returned back to Argentina in 2001. At the present time GP is an Associated Professor at Buenos Aires University, and a member of CONICET (National research commission). She works in the Low Temperature Lab, where she leads the research in vortex physics from 2007. She recently starts developing two new research lines, one of then devoted to study the connection between nematic and superconducting phasesin Fe-based superconductors. Today she will review the main results obtained by her group in vortex physics during the last years, to further present recent results that explain some of the experimental features in term of the strong pinning theory. In the second talk, she will present very recent results evidencing a connection between vortex matter reorganization and a critical dynamic phase transition.

 


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