Chatterji, Tapan and Schneider, G. J. and van Eijck, L. and Frick, B. and Bhattacharya, Dipten (2009) Direct evidence for the Nd magnetic ordering in NdMnO(3) from the hyperfine field splitting of Nd nuclear levels. Journal of Physics-Condensed Matter, 21 (12). Article No.-126003. ISSN 0953-8984

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We investigated the low energy excitations in NdMnO(3) in the mu eV range by a backscattering neutron spectrometer. The energy spectra on polycrystalline NdMnO(3) samples revealed inelastic peaks at E = 2.15 +/- 0.01 mu eV at T = 2 K on both energy gain and energy loss sides. The inelastic peaks move gradually towards lower energy with increasing temperature and tend to merge with the elastic peak at the electronic magnetic ordering temperature of Nd, T(Nd) approximate to 20 K. However, at temperatures higher than T(Nd) approximate to 20 K the energy of the inelastic peak decreases at a much slower rate and remains finite up to T = 55 K, the highest temperature investigated. We interpret the inelastic peaks to be due to the transition between the hyperfine-split nuclear level of the (143)Nd and (145)Nd isotopes with spin I = 7/2 caused by the magnetic ordering of Nd electronic moment below T(Nd) approximate to 20 K. We ascribe the finite energy of the inelastic peak and its much smaller temperature dependence at T > 20 K to be due to the polarization of the Nd magnetic moment by the field of Mn moments that order below T(N) approximate to 78 K.

Item Type: Article
Subjects: Electronics
Depositing User: Ashok K Podder
Date Deposited: 22 Feb 2012 06:01
Last Modified: 01 Apr 2016 06:17

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