Special CMP seminar: Interplay between nematicity and superconductivity in iron-based superconductors
| Date/Time: | Wednesday, 26 Apr 2017 from 11:00 am to 11:50 am |
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| Location: | Physics 18/19 |
| Phone: | 515-294-7377 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
The discovery of the iron-based superconductors (FeSC) has generated intense research interest. In addition to the antiferromagnetism and superconductivity (SC) phases, this system also exhibits a nematic phase, which spontaneously breaks the rotation symmetry of the underlying lattice. Experiments have revealed that this nematic phase is an electronic long range order. To understand the properties of this phase, it is important to study its impact on other physical phenomena, such as magnetism and SC. In this talk, I will discuss the impact of the nematic order and its fluctuations on the SC in the FeSC. The sizable long range nematic order can be induced by the external uniaxial strain when the system is close to the optimal doping. The nematic order leads to the redistribution of orbital weights on bands crossing the Fermi energy. As a consequence, the superconductivity gap nodes are created and annihilated on different Fermi pockets and Tc is enhanced.