English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Electrical and magnetic properties of four series of manganates LnxCa1-xMnO3(Ln=La, Nd, Gd and Y) have been studied in the electron doped regime(x=0.02-0.25) in order to investigate the various inter-dependent phenomenasuch as ferromagnetism, phase separation and charge ordering. The generalbehavior of all the four series of manganates is similar, with some of theproperties showing dependence on the average radius of the A-site cations, <rA>and cation size disorder. Thus, all the compositions show increase inmagnetization at 100-120 K (TM) for x<xmax, the magnetization increasing withincreasing x. The value of xmax increases with decreasing <rA>, probably due tothe increased phase separation induced by site disorder. This is also reflectedin the larger width of the hysteresis loops at T<TM for small x or <rA>. Inthis regime, the electrical resistivity decreases with increasing x, butremains low and nearly constant T>TM. The percolative nature of the conductionmechanism at T<TM is substantiated by the fit of the conductivity data to thescaling law, s \mu |xc-x|p where p is in the 2-4 range. When x>xmax, thematerials become antiferromagnetic and charge-ordered at a temperature TCA,accompanied by a marked increase in resistivity. The value of TCA increaseswith increase in <rA> and x (upto x=0.3). Thus, all the four series ofmanganates are characterized by a phase-separated regime between x=0.02 and0.1-0.15 and an antiferromagnetic charge-ordered regime at x>0.1-0.15.Comment: 23 pages; 9 figures; corrected some typos and added an extra figure; to be published in J.Phys:Condens. Matte

journal of physics. condensed matter

A systematic study of four series of electron-doped rare earth manganates, LnxCa1 xMnO3(Ln La, Nd, Gd and Y) over thex 0.02 0.25 composition range