Bhoi, D and Mandal, P and Choudhury, Pranab and Pandya, S and Ganesan, V (2011) Fe-spin reorientation in PrFeAsO: Evidences from resistivity and specific heat studies. Journal of Applied Physics, 110 (11). Art No:-113722. ISSN 0021-8979

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We report the magnetic field dependence of resistivity (rho) and specific heat (C) for the non-superconducting PrFeAsO compound. Our study shows a hitherto unobserved anomaly at T(SR) in the resistivity and specific heat data, which arises as a result of the interplay of antiferromagnetic (AFM) Pr and Fe sublattices. Below the AFM transition temperature (T(N)(Pr)), Pr moment orders along the crystallographic c axis and its effect on the iron subsystem causes a reorientation of the ordered in-plane Fe moments in a direction out of the ab plane. Application of magnetic field introduces disorder in the AFM Pr sublattice, which, in turn, reduces the out-of-plane Pr-Fe exchange interaction responsible for Fe spin reorientation. Both in rho(T) and d(C/T)/dT curves, the peak at T(SR) broadens with the increase of H due to the introduction of the disorder in the AFM Pr sublattice by magnetic field. In the rho(T) curve, the peak shifts toward lower temperature with H and disappears above 6 T, while in the d(C/T)/dT curve, the peak remains visible up to 14 T. The broadening of the anomaly at T(N)(Pr) in C(T) with increasing H further confirms that magnetic field induces disorder in the AFM Pr sublattice. (C) 2011 American Institute of Physics. [doi:10.1063/1.3666058]

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 07 Aug 2012 11:51
Last Modified: 07 Aug 2012 11:51

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