Photoinduced Metal-to-Insulator Transition in a Manganite Thin Film

Abstract

A persistent photoinduced metal-to-insulator transition has been confirmed in a manganite thin film, Pr_(0.55)(Ca_(0.75)Sr_(0.25))_(0.45)MnO3, near a multicritical point by monitoring with transport measurements and x-ray photoemission spectroscopy. Together with the previously reported reverse effect, the photoinduced insulator-to-metal transition, it is found that the relative stability of the metallic and insulating phases interchanges around 80 K in the middle of a very wide hysteresis loop, which is a manifestation of the large potential barrier due to the long-range elastic energy. It is shown that photons are much more effective in overcoming the barrier via the electronically excited intermediate states than via the heat mode.

Synthesis and characterization of the quasi-two-dimensional triangular antiferromagnets Ni1−xMxGa2S4 (M=Mn, Fe, Co, Zn)

“…Given the fact that the ionic radii of a high (low) spin state of M should be larger (smaller) than that of Ni [10], our results indicate that the substituted M ions at the 6 coordinate sites take high spin states rather than low spin states. Indeed, the fact that all the substituted ions have 2+ valence and high spin states has been also confirmed by our Curie-Weiss fitting to magnetic susceptibility data and X-ray photoemission spectroscopy measurements [11] by using single crystals. More detailed results and discussion concerning physical properties will be described elsewhere [8].…”

Spin Dependent Impurity Effects on the 2D Frustrated Magnetism ofNiGa2S4

“…Furthermore, a systematic change of the lattice constants with x [8] and recent x-ray photoemission spectroscopy measurements [12] also suggest that all the M ions have 2 þ valence and are in the HS states. In Fig.…”

Novel photoinduced phase transitions in transition metal oxides and diluted magnetic semiconductors

“…In the COOI phase on the cooling process, the Mn 2 p spectra taken after laser illumination (wavelength 532 nm) show the enhancement of the FM state, indicating that the COOI state with Jahn-Teller distortion can be changed into the FM state. On the other hand, the FM state on the warming process can be changed into the COOI state by the laser illumination above 75 K [15]. In the COOI phase of Pr 0.55 (Ca 1 −  y Sr y ) 0.45 MnO 3 , the charge and orbital ordering is stabilized by the Jahn-Teller-type lattice distortion as shown in the lower right panel of Figure 1.…”