Related Experiment Video
Updated: Jun 18, 2025
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Picosecond Trajectory of Two-Dimensional Vortex Motion in FeSe_{0.5}Te_{0.5} Visualized by Terahertz Second Harmonic
Sachiko Nakamura1,2, Haruki Matsumoto3, Hiroki Ogawa4
1Cryogenic Research Center, <a href="https://ror.org/057zh3y96">University of Tokyo</a>, Bunkyo, Tokyo 113-0032, Japan.
Physical Review Letters
|August 2, 2024
Summary
Researchers studied vortex motion in iron-based superconductors using terahertz second-harmonic generation. They observed light vortex cores moving independently of quasiparticles at high speeds, revealing novel dynamics in these materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Vortex dynamics are crucial for understanding superconductivity.
- Iron-based superconductors exhibit complex behaviors under external stimuli.
- Previous studies lacked high-frequency insights into vortex motion.
Purpose of the Study:
- To investigate vortex dynamics in FeSe0.5Te0.5 thin films.
- To visualize the high-frequency trajectory of vortex motion.
- To understand the relationship between vortex mass and quasiparticle interactions.
Main Methods:
- Utilized terahertz frequency range for measurements.
- Employed second-harmonic generation (SHG) as the primary observation technique.
- Analyzed vortex motion within a tilted pinning potential induced by Meissner shielding current.
Main Results:
- Visualized picosecond vortex trajectories in two dimensions.
- Observed SHG perpendicular to the driving field, indicating a nonreciprocal nonlinear Hall effect.
- Determined the vortex mass to be as light as a bare electron.
- Found negligible linear Hall effect.
Conclusions:
- Vortex cores move independently from quasiparticles at high frequencies (≈300 km/s).
- Current-induced inversion symmetry breaking is linked to the observed nonlinear Hall effect.
- The findings offer new perspectives on high-frequency vortex dynamics in superconductors.
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