Volume 109, Number 4, February 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 February 2015|
Magnetic phase transition in DyFe0.6Mn0.4O3 crystal investigated with ultrafast spectroscopy
1 Department of Physics, Shanghai University - Shanghai 200444, China
2 Max Planck Institute for Polymer Research - Ackermannweg 10, 55128 Mainz, Germany
3 Institute for Superconducting and Electronic Materials, University of Wollongong - New South Wales 2500, Australia
Received: 29 August 2014
Accepted: 8 February 2015
By use of optical pump-probe spectroscopy, we report the ultrafast carrier dynamics in a DyFe0.6Mn0.4O3 (DFMO) single crystal. We find that the photo-excited electrons firstly relax through a fast electron-phonon coupling , followed by intermediate relaxation (tens of ps) and slow nanosecond relaxation processes. Meanwhile, a photo-induced coherent acoustic phonon with frequency of 36.3 GHz is detected, and the sound velocity with magnitude of is determined. Moreover, the time constants in intermediate relaxation are found to increase significantly in the vicinity of the Morin-like phase transition temperature and the Néel temperature, which are interpreted as the coexisting of collinear- and canted-antiferromagnetic properties in DFMO, and the spectroscopic results are consistent with the temperature-dependent magnetic-moment measurements.
PACS: 78.47.J- – Ultrafast spectroscopy (<1 psec) / 78.20.-e – Optical properties of bulk materials and thin films / 75.47.Lx – Magnetic oxides
© EPLA, 2015
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