Persistent and transient photoconductivity in oxygen-deficientLa2/3Sr1/3

Neutron scattering studies of nanomagnetism and artificially structured materials

“…Examples include producing collective states (mostly in superconductors) by light [144] or with pressure [145]. Similar effects have been observed recently in manganites [146] where persistent photoinduced magnetism was produced. Interestingly, the photoinduced magnetism coincides with the metalinsulator transition in these systems.…”

Complementarity of perturbations driving insulator-to-metal transition in a charge-ordered manganite

“…It is interesting to note that a somewhat similar IMT initiated not by a CW laser but a broad band xenon lamp has been seen in oxygen deficient La 2/3 Sr 1/3 MnO 3 and Pr 2/3 Sr 1/3 MnO 3 films [13,14]. While these authors have attributed the IMT to photo induced electron-hole pair generation, where electrons are trapped at oxygen vacancies and the free hole contribute to conduction, doubts about probable heating effects have been raised [14].…”

“…While these authors have attributed the IMT to photo induced electron-hole pair generation, where electrons are trapped at oxygen vacancies and the free hole contribute to conduction, doubts about probable heating effects have been raised [14]. finally form a conducting channel with the increasing photon flux.…”

“…The external stimuli used to drive the phase collapse are mostly electric [6] and magnetic fields [7], pressure [8] and internal parameters like doping [9] and disorder [10]. Other external stimuli that appears promising to control the phases in manganites is irradiation with optical photons [11,12,13,14,15], x-rays [16] and electrons [17]. A photo-induced insulator-metal transition (PIMT) was observed first by Miyano et al [12] in a Pr 1−x Ca x MnO 3 crystal when the sample was biased with strong electric field in its charge ordered (CO) state.…”

Irreversible effects in LaGa1−xMnxO3

“…have attracted much scientific attention due to effect of the colossal magnetoresistance (CMR) effect and complex diagram of phase transitions in these materials [1]. As was recently reported, some low-doped manganites exhibit effect of irreversibility in transport and magnetic properties induced by optical illumination, thermal, electric or magnetic field cycling in the range of ferromagnetic transition [2][3][4][5][6][7]. These memory effects are explained with intrinsic coexistence of two or more phases with different magnetic and transport properties on the submicrometer scale and microstructural changes in the phases content.…”