| Description: | [DPS Seminar] Soham Manni (Ames Laboratory, Deparatment of Physics and Astronomy Iowa State University) -- Discovery and investigation of magnetically frustrated ground states in correlated electron systems |
| Date: | Wednesday, Jan 25, 2017 |
| Time: | 2 p.m. - 3 p.m. |
| Venue: | G02, Lecture Hall Complex |
| Details: | Strong electron correlation in metallic and insulating systems creates unconventional electronic and magnetic ground states like high Tc superconductors, heavy fermion Kondo lattice or frustrated quantum spin liquid. Magnetic frustration can born either from underlying geometrically frustrated lattice like kagome, hyperkagome and pyrochlore lattice or from dynamically frustrated magnetic exchange interaction like Kitaev exchange. Detail investigation of unconventional ground states requires system in pure single crystalline form. I will introduce different methods of single crystal growth using different members of periodic table. Often we face multiple level of challenges in crystal growth with different elements, I will describe how to overcome them with appropriate choice of environment and technique. I will discuss physics of magnetic frustration in context of 1) Kitaev physics visualized in honeycomb lattice iridates (Na2IrO3 and Li2IrO3) and 2) frustrated Kondo lattice systems. Honeycomb lattice iridates order antiferromagnetically with a very unconventional magnetic structure due to strong anisotropic Kitaev exchange present in the iridate lattice. I will discuss how magnetism in those systems can be tuned by chemical doping to understand underlying magnetic exchange. Frustrated Kondo lattice systems can be useful for realizing interesting quantum critical behavior and quantum spin liquid state in the so called metallic systems. |
| Calendar: | Seminar Calendar (entered by chiranjib) |