Home > Online First > Effects of Cr-doping on the Jahn-Teller, the orthorhombic to rhombohedral, and the magnetic transitions in LaMn1-xCrxO3 compounds > print

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024 7 _ |a 10.1016/j.physb.2020.412101
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100 1 _ |a Georgalas, C.
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245 _ _ |a Effects of Cr-doping on the Jahn-Teller, the orthorhombic to rhombohedral, and the magnetic transitions in LaMn1-xCrxO3 compounds
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520 _ _ |a We report on the electrical resistivity, the specific heat, and differential thermal analysis of LaMn1-xCrxO3 (x=0.00-0.35) polycrystalline compounds at T>300 K, as well as on their magnetic properties in the temperature range from 80 K to 280 K. The transport and the thermal results show that the isovalent substitution of Mn3+ by Cr3+ decreases the cooperative Jahn-Teller distortion and consequently affects orbital ordering in the whole concentration range. It is found that Cr drastically reduces the entropy change associated to the Jahn-Teller transition to negligible values for x≥0.20. The orthorhombic to rhombohedral transition is also displaced to lower temperatures by Cr-doping, however exhibiting non-zero associated enthalpy changes for all x. A ferromagnetic contribution develops in orbitally disordered alloys with x≥0.20. The paramagnetic to ferromagnetic transition temperatures show a similar variation upon increasing x as for the LaMn1-xGaxO3 system, implying a common origin for the ferromagnetic interaction in both systems.
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