Metamagnetic transition of martensitic type in electron-doped manganites Ca1-ΧCeΧMnO3 (Χ= 0.10, 0.12)


Metamagnetic transition of martensitic type in electron-doped manganites Ca1-ΧCeΧMnO3 (Χ= 0.10, 0.12)

Loshkareva, N. N.; Gorbunov, D. I.; Andreev, A. V.; Mushnikov, N. V.; Skourski, Y.; Wolff-Fabris, F.

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-ΧCeΧMnO3, compared to the known system Ca1-ΧSmΧMnO3 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.

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Publ.-Id: 19411