TY  - JOUR
AU  - Georgalas, C.
AU  - Samartzis, A.
AU  - Biniskos, Nikolaos
AU  - Syskakis, E.
TI  - Effects of Cr-doping on the Jahn-Teller, the orthorhombic to rhombohedral, and the magnetic transitions in LaMn1-xCrxO3 compounds
JO  - Physica / B
VL  - 586
SN  - 0921-4526
CY  - Amsterdam
PB  - Elsevier
M1  - FZJ-2020-01403
SP  - 412101 -
PY  - 2020
N1  - Bitte Post-Print ergänzen
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1016/j.physb.2020.412101
UR  - https://juser.fz-juelich.de/record/874383
ER  -