Structural characterization and magnetoresistance of manganates thin films and Fe-doped manganates thin films

Transport and magnetoresistance in double-doped La(2+x)/3Sr(1−x)/3FexMn1−xO3 films

“…Liu et al [24] studied the effect of Fe doping (0 ≤ y ≤ 0.10) in Mn site for the colossal magnetoresistance material La 5/6 Na 1/6 MnO 3 . Canulescu et al [25] observed that the CMR effect depended strongly on the substrate and the oxygen content influenced the transition temperature in La 0.6 Ca 0.4 MnO 3 doped with 20% Fe. Recently, there are a few reports about the Cr or Cu double-doped manganites in La 1−x Sr x MnO 3 system [26,27].…”

One-step preparation of N-doped strontium titanate films by pulsed laser deposition

“…SrTiO 3 ). Previous investigations have shown, that cobaltate and manganate perovskite-type films, prepared by PRCLA using two oxygen sources (N 2 O for the gas pulse and O 2 as the background), can exhibit relatively high oxygen deficiencies of up to δ = 0.6 [26,29]. Most of the films, studied in this work, were deposited using N 2 for the gas pulse and as background gas, i.e.…”

“…Thus, deposition of oxide films by PLD requires an additional source(s) of O to achieve deposition of films without oxygen deficiencies. The most commonly used sources of O are the background gas [20,34], a gas pulse (PRCLA) [26,29], and a RF-induced plasma plume (RFplasma assisted PLD) [35]. In our experiments the growing strontium titanate films are expected to contain anionic vacancies as no additional sources of O are used [33].…”

“…The observed values of oxygen content in the studied films are very close to the ideal stoichiometry value for 3-dimensional perovskites of 3. This is rather remarkable, as the only oxygen source used during deposition is the target, and normally an additional source(s) of oxygen must be supplied to achieve almost ideal oxygen contents in the oxide films deposited by PLD, or to achieve a pure perovskite phase at all [26,29,34,35]. The oxygen content in the studied films is higher compared to the reported value of 2.50 in the strontium titanate films, deposited by PLD at a base pressure of < 10 −5 Pa, while deposition with an oxygen background pressure of 50 Pa results in less oxygen-deficient films ([O] = 2.95) [33].…”

“…This technique is a variant of PLD, which utilises a pulsed gas source synchronized with the laser used for ablating the target material [22][23][24][25][26][27][28]. The gas pulse crosses the ablation plume close to its origin.…”