Electronic phase separation

It is important to point out that the observed two-component EPR spectra are an intrinsic property of the lightly doped LSCO and are not due to conventional chemical phase separation. We examined our samples using x-ray diffraction, and detected no impurity phases. Moreover, the temperature dependence of the relative intensities of the two EPR signals rules out macroscopic inhomogeneities and points towards a microscopic electronic phase separation. The qualitatively different behavior of the broad and narrow EPR signals indicates that they belong to distinct regions in the sample. First we notice that the broad line vanishes at low temperatures. This... 

Phase Separation. The formation of FM clusters in an AFM host matrix in the rare earth manganates has been noticed by many workers. Thus, spin glass behavior has been encountered in the Lni-jArMnOj system at either extreme, corresponding to large or small x. Electronic phase separation is also evidenced... 

Electronic phase separation and other novel phenomena and properties exhibited by mixed-valent rare-earth manganites and related materials... 

Keywords rare-earth cobaltates rare-earth manganites electronic phase separation ... 

Figure 5. Schematic of electronic phase separation. Shaded portions indicate FM metallic regions the unshaded portions correspond to AFM insulating regions, (a) FM metallic puddles in an insulating AFM background, (6) metallic regions with insulating droplets, (c) charged stripes and (d) phase separation on the mesoscopic scale.

Electronic phase separation in rare-earth cobaltates... 

Electronic phase separation in rare-earth cobaltates of the type Lnj-jAj-CoOs has come to the fore in the last 2 years. La0 5Sr0 5Co03 and other members of this family were once considered to be itinerant electron ferromagnets... 

Emery, V. J. Kivelson, S. A. 1993 Frustrated electronic phase separation and high-temperature superconductors. Physica C 209, 597-621. (doi 10.1016/0921-4534(93)90581-A)... 

Rao, C. N. R, Kundu, A. K., Seikh, M. M, Sudheendra, L. 2004 Electronic phase separation in transition metal oxides. Dalton Trans. 3003-3011. 

---