Magnetoresistance studies of La0.6M0.07Ca0.33MnO3 (M  Er, Yb, Bi) perovskites

Magnetic and electronic properties of the magnetoresistive perovskites La0.67−xBixCa0.33MnO3

“…This difference, though small, persists even above ¹ . This has also been discussed earlier on the basis of FMR and magnetization studies [14,16,21]. The value of Curie constant was found to be enhanced by a factor of 2 from the spin only value for temperatures just above ¹ and the tail in the M versus ¹ plot persists beyond ¹ [16].…”

“…The effects of applied pressure and Bi doping may, at least in some case, be expected to show similarities. The substitution of smaller Bi ions for La [26], results in a slight decrease in the lattice parameter [14,27]. This has a substantial effect on the double exchange interactions responsible for the ferromagnetic coupling in these materials as a result of changes in the carrier concentration.…”

“…It is known that small changes in composition and stoichiometry can have remarkable effects on the magnetoresistive properties of these perovskites and that it is often possible to relate this behavior to changes in the lattice properties and in the Mn>/Mn> ratio [9][10][11][12][13]. In recent work, we have investigated La-Er-Ca-Mn-O-based perovskites with small variations in erbium and calcium content [13] and La M Ca MnO perovskites with M"Er, Yb and Bi [14], in order to understand these properties. The Bi containing system shows a particularly high value of the Curie temperature and a substantial GMR effect.…”

Solution sol–gel processing and investigation of percolation threshold in La2/3Ca1/3MnO3:xSiO2 nanocomposite

“…But the small room temperature magnetoresistance (MR) and its high magnetic field (several Tesla) dependence are the major disadvantages of these materials. So far in several reports, substitutions at A and B sites in perovskite structure have been tried to enhance the MR ratio [2][3][4].…”

Preparation of Ti+Ti6Si2B powders by high-energy ball milling and subsequent heat treatment

“…Initially, MA was applied to develop Ni and Fe-based ODS super-alloys containing a dispersion of oxides. The highenergy ball-milling process has successfully produced various intermetallic compounds and RM alloys having high melting points [17]. However, powder mixtures containing ductile particles such as titanium, magnesium, and so on can present difficulties during ball milling behavior due to extensive coldwelding of ductile constituents onto the balls and vial surfaces [18].…”