Journal
PHYSICAL REVIEW B
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024427
Keywords
antiferromagnetic materials; holmium compounds; long-range order; magnetic structure; magnetic transitions; magnetisation; Neel temperature; short-range order; time resolved spectroscopy
Funding
- National Science Council [NSC 95-2112-M-009-037-MY3, NSC 95-2112-M-009-011-MY3]
- MOE-ATU program at NCTU
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We analyze the photo-induced carrier and magnetization dynamics in antiferromagnetic (AFM) HoMnO3 single crystals, delineated by wavelength-dependent femtosecond spectroscopy. The emergence of long-range and short-range magnetic order are unambiguously revealed in association with an abnormal blueshift of Mn3+ 3d level around the Neacuteel temperature and the slope variation in the temperature-dependent transient reflectivity change (Delta R/R) near the Neacuteel transition, respectively. Furthermore, the disturbance (in ps time scale) of the AFM ordering and its reordering time (in a few 100 ps time scale) are clearly identified in the negative Delta R/R. .
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