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Title: Tuning of magnetic ordering by Y substitution onto Tb site in the nanocrystalline TbMnO{sub 3}

We report the magnetic properties, of nano-crystalline powders Tb{sub 1−x}Y{sub x}MnO{sub 3} (x = 0, 0.1, 0.2, 0.3 and 0.4), as perceived by neutron diffraction, and elucidate the effect of Tb site substitution on the magnetic structure of TbMnO{sub 3}. All samples crystallized in the orthorhombic structure conforming to space group Pnma, and exhibited an incommensurate collinear antiferromagnetic ordering of the Mn ions below ∼40 K. Furthermore, at T ≤ 20 K, all these samples showed a change in magnetic structure (of Mn moments) to a spiral ordering down to 2 K, the lowest measured temperature. For the samples with x = 0, 0.1, and 0.2, a short-ranged two dimensional (2D) ordering of Tb moments was also observed at 2 K. However, for the other samples (x = 0.3 and 0.4), no magnetic ordering of Tb moments was found down to 2 K. So with Y substitution, a crossover from 2D ordering to a disordering of Tb moments was observed. The moments at the Mn site were found to be lower than the full Mn{sup 3+} (4μ{sub B}) moment for all the samples below 40 K. The magnetic properties of all the samples studied by us in nano form are more pronounced than those of the reported single crystals of same compositions [V. Yu.more » Ivanov et al., JETP Lett. 91, 392–397 (2010)].« less
Authors:
; ;  [1] ; ;  [2] ; ;  [3]
  1. Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
  2. Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
  3. UGC-DAE Consortium for Scientific Research—Mumbai Centre, R-5 Shed, BARC Campus, Trombay, Mumbai 400085 (India)
Publication Date:
OSTI Identifier:
22492860
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANESE IONS; MONOCRYSTALS; NANOSTRUCTURES; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; POWDERS; SPACE GROUPS; TWO-DIMENSIONAL SYSTEMS