Unusual magnetic behavior of La1−xCaxCoO3−y

Investigation of the electronic structure in La1−xCaxCoO3(x= 0, 0.5) using full potential calculations

“…We take the model with the highest symmetry and the smallest unit cell. The magnetic and the electric properties of La 1−x Ca x CoO 3 system have also been reported [13][14][15][16][17][18][19][20][21][22][23][24], and it has been confirmed that the intermediate state (IS) is stabilized by the Ca 2+ substitution, and the magneto-transport properties can be interpreted as a ferromagnetic metals of itinerant electrons with strong electron-electron correlations. Muta et al [16] have also argued that the observed ferromagnetic saturation moment of 1.2 µ B in metallic La 1−x Ca x CoO 3 (x = 0.2-0.5) is due to stabilization of the IS state.…”

Competing electronic ground states inLa1−xCaxCoOMitchell1, Short2 2004Phys. Rev. B624370View full textAdd to dashboardCite

“…17 La 3ϩ and Ca 2ϩ have very similar ionic radii ͑1.36, 1.34 Å, repectively 18 ͒, but there has been surprisingly little study of the La 1Ϫx Ca x CoO 3 ͑LCCO͒ system. [19][20][21][22][23] Studies of bulk samples have suggested that there are no major differences from the Sr-doped system: all materials are reportedly rhombohedral for all levels of doping, and ferromagnetism is observed in both systems, with the Curie temperature being lower in the Ca-doped materials at a fixed doping level.…”

Giant exchange bias in antiferromagnetic Pr2CoFe0.5Mn0.5O6: a structural and magnetic properties study

“…However, a similar observation of negative magnetization due to the different temperature dependence of individual sublattice for canted AFM G-type system is observed in several reports [27][28][29]. There are several reports on the negative magnetization in the polycrystalline La 1−x Ca x CoO 3 , CaMn 0.96 V 0.04 O 3 , CaMn 1−x Fe x O 3, and CaMn 1−x Sb x O 3 compounds, in which antiparallel ordering of the canted moments arising from the Mn 3+ (Co 3+ )-O-Mn 3+ (Co 3+ ) and Mn 3+ (Co 3+ )-O-Mn 4+ (Co 4+ ) exchange pathways [27,28,30]. Despite this, the role of any small trapped magnetic fields in the superconducting magnet during the ZFC cooling can play a crucial role in deciding the sign of the magnetization in which the FC and ZFC magnetization curves are a replica of each other [31].…”