Biniskos, N.

Georgalas, C.

Samartzis, A.

Syskakis, E.

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  gt; 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  amp; 8805; 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  amp; 8805; 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 system

Effects of Cr doping on the Jahn Teller, the orthorhombic to rhombohedral, and the magnetic transitions in LaMn1 xCrxO3 compounds

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