Structural, magnetic and electronic structure studies of NdFe1−
- Structural, magnetic and electronic structure studies of NdFe1− xNixO3 (0 < x < 0.3)
- xNixO3 (0 < x < 0.3)
- Abida Bashir; M. Ikram; Ravi Kumar; P. Thakur; 채근화; 최원국; V.R.Reddy
- Electronic structure; Magnetic property; M？ ssbauer studies; NEXAFS
- Issue Date
- Journal of physics, Condensed matter : an Institute of Physics journal
- VOL 21, 325501-1-325501-10
- We present here the structural, electronic structure, magnetic and M¨ossbauer studies of
NdFe1−xNixO3 (0 x 0.3) samples. All the samples exhibit a single-phase orthorhombic
structure with space group Pbnm. The near-edge x-ray absorption fine structure (NEXAFS)
studies reveal that, with the Ni substitution at Fe sites, a new spectral feature about 1.5 eV lower
than the pre-edge structure of NdFeO3 in the O K edge is observed due to the 3d contraction
effect and is growing monotonically with the increase of Ni concentration. The Fe L3,2, Ni
L3,2 and Nd M5,4 edges confirm the trivalent state of Fe, Ni and Nd ions. The M¨ossbauer
spectra fitted with two Zeeman sextets confirm the different surroundings of Ni around Fe ions.
With the increase in Ni concentration, the sextets are broadened. The increase of quadrupole
splitting and the decrease of the hyperfine field suggest the change in the ordered regime of the
system. The magnetic behaviour at low temperatures is explained in the context of competition
among moments of rare earth (Nd) and transition metal ions (Fe/Ni). The strong paramagnetic
contribution of the Nd magnetic sublattice and spin flip phenomenon is observed from the
temperature dependence of zero-field-cooled and field-cooled magnetization where spin
crossover is observed. The isothermal hysteresis loops show a decrease of magnetization and
increase of coercivity with the increase in temperature and complements magnetization versus
temperature. The results are explained on the basis of the spin reorientation phenomenon.
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