Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.037203
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Funding
- LCLS
- Stanford University through SIMES, LBNL
- University of Hamburg through the BMBF [FSP 301]
- NCCR-MUST
- NCCR-MaNEP
- Swiss National Science Foundation
- Alexander von Humboldt Foundation
- Engineering and Physical Sciences Research Council [EP/H033939/1, EP/J012912/1] Funding Source: researchfish
- EPSRC [EP/H033939/1, EP/J012912/1] Funding Source: UKRI
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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 reorientation transition in CuO is limited by the long-wavelength magnetic excitation connecting the two phases.
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