Melting of magnetic order in ${\mathrm{NaOsO}}_{3}$ by fs laser pulses

TL;DR

This study investigates how femtosecond laser pulses can rapidly disrupt magnetic order in NaOsO₃, revealing a sub-100 femtosecond timescale for the melting of antiferromagnetic order, much faster than lattice responses.

Contribution

First direct measurement of ultrafast magnetic order melting in NaOsO₃ using time-resolved magnetic X-ray diffraction.

Findings

Antiferromagnetic order melts in under 100 fs.

Magnetic dynamics occur faster than lattice structural changes.

Lattice response occurs on a timescale of several picoseconds.

Abstract

NaOsO$_3$ has recently attracted significant attention for the strong coupling between its electronic band structure and magnetic ordering. Here, we used time-resolved magnetic X-ray diffraction to determine the timescale of the photoinduced \afm dynamics in NaOsO$_3$. Our measurements are consistent with a sub-100~fs melting of the \afm long-range order, that occurs significantly faster than the lattice dynamics as monitored by the transient change in intensity of selected Bragg structural reflections, which instead show a decrease of intensity on a timescale of several ps.