Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO

Details Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO Femtosecond dynamics of the collinear-to-spiral antiferromagnetic phase transition in CuO

2011-06-30

arxiv.org/abs/1106.6128v4

Phys. Rev. Lett. 108, 037203 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted by Physical Review Letters (Dec. 2, 2011)

Scientific paper

10.1103/PhysRevLett.108.037203

We report on the ultrafast dynamics of magnetic order in a single crystal of CuO at a temperature of 207 K in response to strong optical excitation using femtosecond resonant x-ray diffraction. In the experiment, a femtosecond laser pulse induces a sudden, nonequilibrium increase in magnetic disorder. After a short delay ranging from 400 fs to 2 ps, we observe changes in the relative intensity of the magnetic ordering diffraction peaks that indicate a shift from a collinear commensurate phase to a spiral incommensurate phase. These results indicate that the ultimate speed for this antiferromagnetic re-orientation transition in CuO is limited by the long-wavelength magnetic excitation connecting the two phases.

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