Magnetic phase transition in DyFe0.6Mn0.4O3 crystal investigated

Authors

Qunfeng Pan, Shanghai University
Zeyu Zhang, Shanghai University
Zuanming Jin, Shanghai University
Xian Lin, Shanghai University
Guohong Ma, Shanghai University
Hui Shen, University of Wollongong, Shanghai Institute of TechnologyFollow
Fang Hong, University of WollongongFollow
Zhenxiang Cheng, University of WollongongFollow

RIS ID

99451

Publication Details

Pan, Q. F., Zhang, Z. Y., Jin, Z. M., Lin, X., Ma, G. H., Shen, H., Hong, F. & Cheng, Z. X. (2015). Magnetic phase transition in DyFe_0.6Mn_0.4O₃ crystal investigated. Europhysics Letters: a letters journal exploring the frontiers of physics, 109 (4), 47002-p1-47002-p5.

Abstract

By use of optical pump-probe spectroscopy, we report the ultrafast carrier dynamics in a DyFe_0.6Mn_0.4O₃ (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 2.65 x 10³ m/s 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.