Dimensional image theory of heavy fermion system
Speaker: Dr. Yang YifengLos Alamos National LaboratorySummary:Heavy fermion superconductors are the earliest non-traditional superconductors. Various new phenomena have been found in the study of heavy fermion materials, including the coexistence of unconventional superconducting and antiferromagnetic phases, and new quantum critical behavior The Based on the analysis of various abnormal behavior of heavy fermion material, we propose a new dimension theory based on experiment. The theory contains the following main elements: any weight fermi material has a uniform temperature scale, T *, marking the system from the disordered local spin state to the associated state of the transition, T * from the f between the electronic When the temperature is lower than T *, f electrons and conduction band electrons are collectively hybridized, develop coherence and produce a new quantum state (Kondo liquid) with universal behavior, leading to the abnormal behavior of each physical quantity; At lower temperatures, the Kondo liquid appears to have a critical fluctuation, or a superconducting condensation occurs, or re-localized to participate in antiferromagnetic sequencing. These empirical rules have been validated for a large number of experiments and are also validated in the newly discovered CePt2In7. I will systematically introduce this progress in the report.Related literature:[1] Yang Yifeng, David Piennes, Physics Rev .. The 100,096404 (2008).[2] Yang Yifeng et al., Nature 454, 611 (2008).[3] Yang Yifeng, Physics B: Rapid Commune 79,241107 (2009).[4] Yi-feng Yang et al. , Phys. Rev .. The 103,197004 (2009).[5] Yi-feng Yang et al. , ArXiv: 1005.5184 (2010).Dr. Yang Yifeng Introduction:(2007, 2003), received a Ph.D. degree from Germany's Max & Poor's (2007), and then followed David Pines as a postdoctoral fellow at UC Davis, now the Las Alamos National Experiment Director's Postdoctoral Fellow. Dr. Yang Yifeng has a very good academic record, he has Nature, Nature Phys., PRL and other journals published several articles, many articles are the first author.Time: June 8 (Tuesday) 4:00 pmLocation: Yuquan Campus 12-423welcome to join! Condensed matter physics
2010-6-8
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