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

Magnetic and electrical properties of electron-doped manganites Ca0.88Ce0.12MnO3 and Ca0.90Ce0.10MnO3 were studied in pulsed magnetic fields up to 60 T in the temperature range T = 1.5–260 K. Metamagnetic transition caused by the melting of the charge/orbital ordering and martensitic structural transition in a magnetic field was revealed. The transition is accompanied by a change in electrical resistivity of the sample by three orders. A magnetic phase diagram in the plane of the H–T was constructed. Higher values of the critical transition fields for the system Ca1−xCexMnO3, compared to the known system Ca1−xSmxMnO3 are explained by a narrower range of phase separation and a bigger difference between the Néel temperatures of the C and G-type antiferromagnetic phases, which originated from the difference between the valence of the Ce4+ and Sm3+ ions.

► Ca1−xLnxMnO3 (Ln – rare-earth ions) manganites display large-scale phase separation.
► We studied Ca1−xCexMnO3 (x = 0.10, 0.12) in high magnetic fields up to 60 T.
► Metamagnetic transitions and giant magnetoresistance are observed in Ca1−xCexMnO3.