| Description: | [DPS Seminar] Dr. Mayukh Majumder (Max Planck Institute for Chemical Physics of Solids, Dresden) -- In search of Quantum Spin Liquid: A microscopic insight |
| Date: | Wednesday, Jan 17, 2018 |
| Time: | 2 p.m. - 3 p.m. |
| Venue: | G02, Lecture Hall Complex |
| Details: | Competing exchange interactions in frustrated systems often responsible for a large degeneracy in the ground state and in some conditions a novel state of matter called “spin liquid” emerges where spins are highly correlated and fluctuates down to low temperatures. A very few candidate quantum spin liquid (QSL) materials proposed over the last decade bear key experimental signatures of this exotic state, including persistent spin dynamics and the absence of long-range order within the experimentally accessible temperature range. Kitaev model with anisotropic interactions on the honeycomb lattice offers an exact solution for the QSL state and expands the grounds for the QSL search from purely isotropic models to systems with strong magnetic anisotropy. There are few candidate materials where the evidence of Kitaev exchanges have been found but these materials undergoes a long range magnetic ordering because of the presence of non-negligible exchanges other than the Kitaev type exchange. Tuning the ground state of these Kitaev systems might be an ideal route to stabilize a QSL state by the application of magnetic field and external pressure. I will be discussing about my journey in the field of these Kitaev systems where we tried to stabilize a QSL state by applying magnetic field and pressure. Furthermore, we also looked for other crystallographic structure which can have QSL state with the presence of Kitaev exchange. All the evidences are mainly based on local techniques (Nuclear Magnetic Resonance (NMR) and Muon Spin Resonance (μSR)) as bulk techniques are quite inadequate in addressing the actual behavior of such complex states. |
| Calendar: | Seminar Calendar (entered by anandamohan) |