The influence of nanoscopic magnetoelectronic phase separation on electrical transport in La1-x Srx CoO3 crystals is reported. It is demonstrated; (i) that the T=0 metal-insulator transition can be quantitatively understood using double exchange-modified percolation theory, and, (ii) that the onset of a phase-pure low T ferromagnetic state at high x has a profound effect on the high T transport due to a crossover in the nature of the spin fluctuations. It is concluded that many features of the transport in La1-x Srx CoO3 can be thoroughly understood based on our current understanding of the phase-separated state.
|Original language||English (US)|
|Journal||Applied Physics Letters|
|State||Published - 2009|
Bibliographical noteFunding Information:
Work at UMN supported by DoE (Grant No. DE-FG02-06ER46275, for neutron scattering), NSF (Grant No. DMR-0804432), and Dept. of Commerce. Work at ANL supported by DoE under Grant No. DE-AC02-06CH11357.