Low temperature charge order in IrTe2 – searching for superconductivity with ultrafast optical pulses
Department of Complex Matter, IJS
We have studied the charge ordered phases in IrTe2, a van-der-Waals material in which superconductivity was shown to emerge either in thermally quenched nanoflakes, or in bulk samples where it competes with the Ir3+/Ir4+ dimerization induced stripe order and is stabilized by doping with Pt or Pd. Additionally, in pristine samples superconducting hexagonal surface patches, similar to those found in doped materials, were reported to form at three-fold striped phase intersections.
We have investigated the dynamics of the material in a broad range of temperatures and identified its structural phases, which are connected by first order phase transitions and exhibit a broad hysteresis loop in heating/cooling cycles. High fluence exposure at low temperatures results in non-thermal behavior where the increased anisotropy in amplitudes of relaxation components of transient reflectivity might suggest enhanced order under exposure. A transition from the low-temperature to the middle-temperature phase is observed in three-pulse destruction-pump-probe measurements several picoseconds after the arrival of the destruction pulse, but no persistent changes are induced at this temperature. However, after subjecting the material to trains of high fluence laser pulses and imaging the surface in situ in STM at helium temperature, healing of defects in the charge order, stabilization of the middle temperature phase and a change in orientation of the striped phase were observed.
The seminar will take place via Zoom. The details for connecting to the meeting can be found below:
Join Zoom Meeting
Meeting ID: 934 4228 3786
Calendar of upcoming seminars
|Date||Name||Topic of the seminar|
|29.10.2020||Irena Drevenšek Olenik||Magnetically tunable surface properties of magneto-active elastomers|
|5.11.2020||Tomaž Mertelj||Kinetics bottleneck during photoinduced ultrafast insulator-metal transition in 3D orbitally-driven Peierls insulator CuIr2S4|
|19.11.2020||Darja Lisjak||MAGNELIQ-H2020-FETOPEN, A Magneto-Electric Liquid – to Sense Better|
|10.12.2020||Martina Knavs||Opportunities in Horizon Europe (FP 2021 – 2027)|
Link to previous seminars: