Magnetic, electrical, and optical properties of Ca1 − x Ce x MnO3 (x ≤ 0.12) single crystals

Metamagnetic transition of martensitic type in electron-doped manganites Ca1−xCexMnO3 (x=0.10, 0.12)

“…1 (data from Ref. [15]), demonstrate the temperature evolution of the electronic and magnetic states of the Ca 1Àx Ce x MnO 3 (x = 0.10, 0.12) single crystals. Electrical resistivity of the samples displays semiconductor-like behavior in the whole temperature range.…”

“…The resistivity growth and magnetization drop are related to charge/orbital ordering. The ordering temperature T CO/OO for the crystal with x = 0.10 is 185 K and for the crystal with x = 0.12 it is equal to 222 K [15]. The temperature hysteresis of magnetization in the range T =100-300 K points to the first-order transition from the orthorhombic paramagnetic semiconducting phase to the monoclinic C-type antiferromagnetic charge-ordered isolating phase.…”

“…[15]. The results were interpreted using the neutron diffraction and high-resolution synchrotron X-ray diffraction data obtained in Ref.…”

“…As noted in Ref. [15], the Ca 1Àx Ce x MnO 3 (0 < x 6 0.12) single crystals grown by the floating zone method contained a considerable amount of cation vacancies predominant over oxygen vacancies in comparison with polycrystals studied earlier in [5]. On account of the complicated phase composition and the presence of twins and defects, measurements of anisotropy of physical properties cannot be done on these samples.…”

“…Ca 1Àx Ce x MnO 3 (x = 0.10, 0.12) single crystals were grown by the floating zone method with radiation (light) heating at a rate of 8.5 mm/h in air flow on an URN-2-ZP setup in Moscow Power Engineering Institute [15]. An X-ray diffraction study showed that in the single crystals with x = 0.10 and 0.12 at room temperature, apart from the pseudocubic lattice (with orthorhombic distortions), the monoclinic P2 1 /m phase is present with a dominant volume fraction for the composition with x = 0.12.…”