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The dynamics of the charge ordered (CO) state under non-equilibriumconditions created by strong dc-electric field (~106 V/cm) andphoto-illumination with short (~ 6 ns) laser pulses is investigated inBi1-xCaxMnO3 (x > 0.5) epitaxial films. A pulsed laser deposition method wasused to synthesize films on (100) LaAlO3 (LAO) and (100) SrTiO3 (STO)substrates. The crystallographic structure, temperature dependence ofelectrical resistivity and magnetization of the samples of differentcomposition prepared under different oxygen partial pressure (pO2) anddeposition temperature (TD) are studied. For the x = 0.6 sample grown on LAO, aclear signature of charge ordering at ~275 K is seen in the magnetization andat ~ 260 K in the resistivity data. The same sample grown on STO revealed acomplex behavior, which entails charge ordering at ~300 K, a Neel order at ~150K and finally a weak ferromagnetic phase below 50 K. A strong correlationbetween charge ordering temperature (TCO) and the c-axis lattice parameter (c)of the type (dTCO/dc ~-350 K/A) imerges from measurements on films depositedunder different growth conditions. Since the out of plane lattice parameter (c)increases with in plane compressive strain, this effect directly show acompressive strain induced suppression of the TCO. The current (I)- voltage (V)characteristics of the samples at T < TCO show hysteresis due to a compoundeffect of Joule heating and collapse of the CO state. Transient changes inconductivity of lifetime ranging from nano to microseconds are seen at T < TCOon illumination with pulsed UV (355 nm) radiation. These observations areexplained on the basis of the topological and electronic changes in the chargeordered phase.Comment: 19 figures, 34 page

physical review. b, condensed matter and materials physics

Studies of structural, magnetic, electrical, and photoconducting properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>epitaxial thin films

Studies of structural, magnetic, electrical, and photoconducting properties ofBi1−xCaxMnO3epitaxial thin films