Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7

Anomalous Reflectivity Oscillation of Layered Manganite La0.5Sr1.5MnO4

“…Time-resolved optical spectroscopy is a suitable method to investigate the relaxation process relevant to the strong coupling. [2][3][4] In our previous work, we performed an optical experiment to study the temperature dependence of the relaxation process in a layered manganite La 2À2x Sr 1þ2x Mn 2 O 7 (x ¼ 0:38) crystal by the pump-probe method. 3) In this experiment, we measured the ultrafast transient reflectivity at several temperatures; however, we could not ensure the reproducibility of the data below 50 K. Then, we studied reflectivity itself in low temperature regions under several conditions and found that it oscillates with an anomalously long period.…”

Interface-induced magnetic coupling in multiferroic/ferromagnetic bilayer: An ultrafast pump-probe study

“…16 The third anomaly is near magnetic transition temperature of LSMO (T C ) as it is a typical behavior of spin-lattice relaxation time of LSMO. 14,19 The fact that the temperature-dependent signature of LSMO appears in the TMO relaxation channels, and vice versa, indicates that the spin dynamics of LSMO and TMO in our bilayer structure are interrelated.…”

“…13 The zero crossing is a common characteristic of manganites. 14,15 (3) At this point, the electron and phonon baths are almost in thermal equilibrium. However, the electron and phonon temperatures are still high compared to the temperature of the spin reservoirs.…”

“…where A's, B's, and C are positive numbers. [13][14][15][16] All five exponential terms must be present to successfully fit DR=R across the whole temperature range by starting from the first negative peak. The first two exponential terms describe the fast negative decay (labelled as 2 in Fig.…”

Ultrafast Jahn–Teller polaron dynamics in a bi‐layered manganite single crystal

“…In general, the temperature dependence of the carrier relaxation dynamics shows a dramatic change near the phase transition temperature . Compared with the three‐dimensional perovskite manganite La 0.7 Ca 0.3 MnO 3 , layered manganites such as quasi two‐dimensional La–Sr–Mn–O single crystal have been less studied so far . In this paper, using time‐resolved differential reflectivity spectroscopy, the dynamical phase transition between the PM and FM phases in a single crystal of bilayer manganite La 1.2 Sr 1.8 Mn 2 O 7 has been resolved.…”