Linear relationship between magnetic hyperfine field and electric-field gradient at Mn sites in lanthanum strontium manganite

Competing magnetic phases in La0.7Sr0.3MnO3as deduced from Mn site hyperfine parameters

“…It has been shown that Hf substitutes two distinct Mn sites, namely rich in Mn 4+ and deficient in Mn 4+ , in La 0.7 A 0.3 MnO 3 (A = Ca, Sr). In La 0.7 Sr 0.3 MnO 3 , Mn 4+ rich zones were observed to exhibit ferromagnetic while Mn 3+ rich zones canted weak antiferromagnetic ordering in the temperature interval between 300 and 360 K [17]. Present measurements extended down to 10 K bring out interesting results of phase separation of CAFM to FM zones.…”

“…However, a detailed picture involving the changes in both the MHF and EFG of the coexisting phases and hence the complete atomic scale understanding of these phases is yet to emerge. Using time differential perturbed angular correlation (TDPAC), a hyperfine interaction technique with 181 Hf/Ta probe, it has been shown that Hf substitutes Mn sites in undoped [14,15] and Ca/Sr doped LaMnO 3 [16,17]. The MHF as perceived by the probe nucleus (Ta) occupying Mn sites is due to the transfer of spin density from magnetically ordered Mn d orbitals through O p orbitals on to primarily the 4s and 5s orbitals of the probe ion, namely the super transferred hyperfine field (STHF).…”

“…This implies the presence of two distinct Mn sites in the matrix. Based on detailed PAC measurements on the aspects of ferromagnetic to paramagnetic phase transition, the effect of external magnetic field and oxygen stoichiometry effects, these sites are identified to be rich and deficient in Mn 4+ [17]. The occurrence of such Mn 3+ rich and Mn 4+ rich zones have been identified in LCMO based on PAC studies related to oxygen stoichiometric effects.…”

Novel Insights of Enhanced Magnetization and Magnetoelectric Coupling in the Nanocomposite of BiFeO3 with Lanthanum Strontium Manganite

“…Among the ferromagnetic oxides, manganites exhibiting colossal magnetoresistance (CMR) might be a good choice as these oxides exhibit a strong correlation between spin, charge, orbital, and lattice degrees of freedom [27][28][29][30] leading to the scope of significantly improving the multifunctionality of the devices made in combination with BiFeO 3 . Electric field controlled magnetization and exchange bias effects have been demonstrated in a model system of BiFeO 3 along with half metallic and colossal magnetoresistive manganite.…”

Atomic scale study of thermal reduction of nano goethite coexisting with magnetite

“…The local structure and magnetic properties of the bulk and nano particles of a number of important functional oxides have been studied using hyperfine techniques [22][23][24][25][26][27][28][29][30][31][32][33] based on the interaction between nuclear moments of the probe atoms with electro magnetic fields at the sites of occupancies in these systems. Mossbauer spectroscopy has been extensively used to study structural and magnetic properties of oxy hydroxides and oxides of Fe based on the experimentally derived hyperfine parameters such as isomer shift, quadrupole splitting and magnetic hyperfine field as experienced by relative fractions of 57 Fe resonant absorber atoms occupying distinct sites.…”