Activities
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Seminars
| Seminar on Theoretical and Computational Physics:
| | Title | The influence of coulomb potential fluctuation on c-axis tunneling in cuprates
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| Speaker | Dr. Pham Tuan Minh
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| Affiliation | Center for theoretical physics, Institute of Physics, VAST
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| Date | Tuesday, 08-04-2014
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| Time | 10:00 AM
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| Location | Meeting room, first floor, Institute of physics, 10 Dao Tan, Ba Dinh, Hanoi
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| Abstract | The subject is studying the resistivity along c-axis direction in cuprates, layered high-temperature superconducting materials as a function of temperature. A point-to-point tunneling model is built to describe the tunneling between two CuO2 planes including the in-plane Coulomb interaction. The c-axis resistivity is calculated in both gapless and gap cases as a function of the temperature and the strength of the Coulomb fluctuation. The dimensionless parameter α characterizing the strength of the Coulomb fluctuation is calculated theoretically in the random-phase approximation (RPA) and in the Landau-Fermi liquid theory. It turns out the theoretical form of the c-axis resistivity fits quite well with experimental data in both the metallic (gapless) region and the metal-insulator crossover (pseudogap) region of the c-axis resistivity. The parameter α in the fitting is also compared with the solution in the RPA calculation.
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