Stability of charge ordering in La0.5−xHoxCa0.5MnO3 polycrystalline manganites

Abstract

Magnetotransport properties of La0.5-xHoxCa0.5MnO3 (x=0.05 and 0.1) polycrystalline samples were investigated in order to study the effect of magnetic Ho 3+ ions on the stability of the charge ordering (CO) and magnetic phase coexistence in pristine La0.5Ca0.5MnO3. Our samples were synthesized by using sol-gel method. Temperature dependence of resistivity shows an insulating behavior with high resistivity values, confirming the presence of long-range CO. The application of 7 T magnetic field slightly reduces resistivity values and demonstrates relatively small magnetoresistance (MR) values (-MR(T) did not exceed 14 % under 7 T applied field). This observation indicates that the CO in the Ho-based specimens is strong, which indicates that Ho-substitution for La in La0.5Ca0.5MnO3 gives more strength to the CO.

Engineering of Advanced Materials for High Magnetic Field Sensing: A Review

“…Table 1 presents typical magnetoresistance values in high magnetic fields at low and high temperatures. As numerous investigations were performed on manganites with various doping elements, Table 1 also presents some typical results reported on La 0.67 Ba 0.33 MnO 3 [ 80 ], La 0.4 Gd 0.1 Ca 0.5 MnO 3 [ 81 ], La 0.45 Ho 0.05 Ca 0.5 MnO 3 [ 82 ], La 0.45 Ca 0.55 MnO 3 [ 83 ] and La 0.5 Ca 0.4 Li 0.1 MnO 3 [ 84 ] materials not discussed more detailed in this review.…”