Magnetic and electrical properties of Cu substituted La1−xCaxCoO3 crystals

Magnetic, Electronic Transport, and Calorimetric Investigations of La1-xCaxCoO3in Comparison with La1-xSrxCoO3

“…For x ¼ 0:4 and 0.5, on the other hand, increases with increasing temperature above 100 K as usually observed in metals. The overall feature of in the present study is consistent with the previous one for the bulk sample, 21) but different from the one for the thin films 20) (see Fig. 5).…”

“…1(a), 1(b), and 1(c), respectively, together with those in the previous studies. For M = Ca, the overall composition dependence of the lattice parameters in the present study is consistent with the previously reported ones, 18,21) although a single rhombohedral phase in all the composition range is assumed in them. For M = Sr, however, the lattice parameters in the present study are systematically different from the previous ones 23) in the composition range with x > 0:2, and the reported miscibility gap at around x ¼ 0:15 is not found in the present study.…”

“…The magnetic and the electric properties of La 1Àx Ca x CoO 3 has been reported. [18][19][20][21] However, the reported data alone are not sufficient to allow us making a quantitative comparison between the Ca-and Sr-substituted series. Incidentally, an unprecedentedly large spontaneous Hall effect is reported for La 0:8 Ca 0:2 CoO 3 thin films epitaxially grown on LaAlO 3 .…”

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.…”

Magnetic and structural transitions inLa1−xAxCoO3(Kriener1, Braden2, Kierspel3 et al. 2009Phys. Rev. B360350View full textAdd to dashboardCite

“…Several publications report a reduction of the rhombohedral distortion upon increasing Ca concentration, but it remains controversial which structure is eventually realized. Early reports treated the compositions 0.1Յ x Յ 0.35 as rhombohedral, 33,37 in contrast to Ref. 19 which suggests a superposition of rhombohedral and pseudocubic phase fractions for 0.2Ͻ x Ͻ 0.5 at room temperature.…”