title: Low-field magnetoresistance effect in core-shell structured La(0.7) Sr(0.3) CoO(3) nanoparticles.
abstract: Core-shell structured La(0.7) Sr(0.3) CoO(3)  nanoparticles are synthesized and their magnetic and magneto-transport properties are investigated. In these core-shell La(0.7) Sr(0.3) CoO(3)  nanoparticles, the cores are single-crystalline and ferromagnetic, whereas the shells are noncrystalline and predominantly paramagnetic. Moreover, the insulating-like shells can serve as a good spin tunneling barrier. Therefore, in such a special core-shell structure, the spin-polarized interparticle tunneling is improved due to the existence of shells, which thus induces an enhanced low-field magnetoresistance effect.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore. wangyanghit@gmail.com
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Fan
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D008280:Magnetics; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D003035:Cobalt; D014025:Titanium; C060728:cobalt oxide; D013324:Strontium