Chatterji, Tapan and Ouladdiaf, Bachir and Bhattacharya, Dipten (2009) Neutron diffraction investigation of the magnetic structure and magnetoelastic effects in NdMnO(3). Journal of Physics-Condensed Matter, 21 (30). Article No.-306001. ISSN 0953-8984

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We investigated the evolution of the magnetic structure and magnetoelastic effects of NdMnO(3) by neutron powder diffraction. We confirmed the A-type antiferromagnetic (AF) structure of NdMnO3 below TN approximate to 82 K with magnetic moments parallel to the b axis of the orthorhombic crystal structure (space group Pbnm). We found that the magnetic moments of Nd order below about T(N) (Nd) approximate to 20 K in a ferromagnetic structure with moments parallel to the c axis. At the same temperature the magnetic moments of Mn develop a ferromagnetic component parallel to the c axis. We found strong magnetoelastic effects associated with the AF transition at T(N) approximate to 82 K. The effect is very prominent for the b lattice parameter. All three lattice parameters and therefore the unit cell volume contracts at T(N) approximate to 82 K. We treated quantitatively the magnetoelastic effect of the b lattice parameter and found that the extra change in the lattice parameter Delta b due to the magnetoelastic effect is proportional to the magnetic moment of the Mn ion. We also determined the critical exponent of the AF phase transition to be beta = 0.296 +/- 0.008.

Item Type: Article
Subjects: Electronics
Depositing User: Ashok K Podder
Date Deposited: 22 Feb 2012 06:01
Last Modified: 01 Apr 2016 06:09

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