| Description: | [DPS Seminar] Dr. Tulika Maitra (Dept. of Physics, IIT Roorkee) -- Nature of spiral magnetic state and electric polarisation in Sr-doped YBaCuFeO5 : A first-principles study |
| Date: | Monday, Jul 02, 2018 |
| Time: | 11:30 a.m. - 1 p.m. |
| Venue: | 113, DPS Meeting Room, RC |
| Details: | The nature of the spiral magnetic state in type II multiferroic YBaCuFeO5 has recently been a matter of debate. Using first principles density functional theory (DFT) calculations within LSDA+U+SO approximation, we reveal the nature of spiral state and corresponding ferroelectric response in the incommensurate magnetic phase of YBaCuFeO5. A helical spiral state with spins living in the ab-plane is found to be more stable. Owing to negligibly small Dzyaloshinskii-Moriya interaction and the absence of any spin current mechanism in the helical spiral state, electric polarization is predicted to be zero[1]. These results are in good agreement with the recent single crystal data[2]. We further investigated YBa1− |
| Calendar: | Seminar Calendar (entered by anandamohan) |