Magnetic and dielectric behavior in YMn{sub 1−x}Fe{sub x}O{sub 3} (x ≤ 0.5)

Journal Article · Sat Jun 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4882069· OSTI ID:22304201

Sharma, Neetika; Mishra, S. K.; Meena, S. S. ^[1]; Prajapat, C. L.; Singh, M. R. ^[2]

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1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
2. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

The role of doping Fe on the structural, magnetic, and dielectric properties of frustrated antiferromagnet YMn{sub 1−x}Fe{sub x}O{sub 3} (x ≤ 0.5) has been investigated. The neutron diffraction analysis shows that the structure of these polycrystalline samples changes from hexagonal phase (space group P6{sub 3}cm) to orthorhombic phase (space group Pnma) for x > 0.2. The frustration parameter decreases with Fe substitution. All the compounds are antiferromagnetic, and the magnetic structure is described as a mixture of Γ3 and Γ4 irreducible representation (IR) in the hexagonal phase, and the ratio of these two IRs is found to vary with Fe doping (x ≤ 0.2). A continuous spin reorientation as a function of temperature is observed in these samples. The magnetic ground state in the orthorhombic phase of the higher doped samples (x ≥ 0.3) is explained by taking Γ1 (G{sub x}C{sub y}A{sub z}) representation of Pnma setting. In YMnO{sub 3} suppression of dielectric constant ε′ is observed below T{sub N} indicative of magnetoelectric coupling. This anomalous behavior reduces in Fe doped samples. The dielectric constant is found to be correlated with the magnetic moment (M) obtained from neutron diffraction experiments and follows a M{sup 2} behavior close to T{sub N} in agreement with Landau theory.

• OSTI ID: 22304201
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DOPED MATERIALS
FERRITES
GROUND STATES
HEXAGONAL LATTICES
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
PERMITTIVITY
PHASE SPACE
POLYCRYSTALS
TEMPERATURE DEPENDENCE
YTTRIUM COMPOUNDS