Tuning of the charge ordered state in the manganite thin films by internal or external strains

Abstract

The integrated cold box and demethanizer system as one of the most critical production sections in an ethylene plant couples multistage refrigeration and cryogenic separation to extract hydrogen and methane from the cracked gas feed. Ethylene and the heavier components are liquefied for recovery in the downstream process. During separation, ethylene contained in the methane and hydrogen streams is accounted as the product loss which in reality is significant. To reduce the ethylene loss with energy consumption consideration, a systematic methodology has been developed to optimize the process operation of the integrated cold box and demethanizer system. It covers rigorous simulation model development and validation, sensitivity analysis, operational optimization, and result analysis. The optimization results demonstrate the significant economic benefits of the proposed methodology.

Exchange Bias Effect and Suppression of Charge Ordering Induced by a Surface Phase Separation in La0.25Ca0.75MnO3 Nanowires

“…In ref the diameter of Ni nanowires prepared by electrodeposition is the same as that of the alumina pore, while in our case the average diameter of the nanowires of 60 nm is smaller than that of the alumina pore (70 nm) (see the bottom inset in Figure a) because during the temperature ramping to 600 °C, the gel precursor spontaneously burns liberating vapors such as H 2 O, NO x , and CO x , which causes shrinkage of the nanowires’ volume. So the strains induced by the different thermal expansion between the matrix and the wires on the LCMO nanowries could be much smaller compared with that in refs − , and its influence on the magnetic properties is weak too. Although the contrast of the magnetic properties between the La 0.25 Ca 0.75 MnO 3 nanowires and its corresponding bulk is remarkable, for the free nanowires, the difference compared with nanoparticles is very small. , As mentioned above, the nanowires are polycrystalline and made of nanoparticles, therefore the physical properties of the free nanowires clustered together are similar to those of clustered nanoparticles, but the aligned nanowire arrays exhibit unique perpendicular magnetic anisotropy.…”

Charge order quenching, Griffiths phase, and magnetotransport in polycrystalline Pr0.58Ca0.42−ySryMnO3 thin films

“…It has been shown that hydrostatic pressure can destabilize the COI and promote the growth of FMM at the cost of AFMI/FMI 19. In case of thin films, in‐plane compressive strain has the similar effect resulting in insulator–metal transition (IMT) and CMR 29–31. On the contrary, the in‐plane tensile strain has an adverse effect and it strengthens the AFM/COI component 32, 33.…”

A practical MOCVD approach to the growth of Pr1-xCaxMnO3films on single crystal substrates

“…Large parts of these applications require PCMO in form of thin films. PCMO thin films have been synthesized by various physical methods, such as pulsed laser deposition , molecular beam epitaxy , and magnetron sputtering .…”