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Magnetisation reversal in Ca2PrCr2NbO9 and Ca2PrCr2TaO9

DOI: 10.1016/j.jssc.2018.09.012 DOI Help

Authors: Emily C. Hunter (University of Oxford) , Simon Mousdale (University of Oxford) , Peter D. Battle (University of Oxford) , Maxim Avdeev (The University of Sydney)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Solid State Chemistry

State: Published (Approved)
Published: September 2018
Diamond Proposal Number(s): 13284

Abstract: Polycrystalline samples of the perovskites Ca2PrCr2BO9 (B=Nb, Ta) have been synthesised using the standard ceramic method and characterized by x-ray diffraction, neutron diffraction and magnetometry. Both crystallise in the orthorhombic space group Pnma and exhibit magnetisation reversal when field-cooled in an applied field of 100 Oe. The absolute value of the negative magnetisation at 2 K in an applied field of 100 Oe is an order of magnitude greater in Ca2PrCr2TaO9 than it is for Ca2PrCr2NbO9. Magnetometry and powder neutron diffraction showed that the Cr3+ cations in Ca2PrCr2NbO9 and Ca2PrCr2TaO9 order in a GyFz magnetic structure below 110 and 130 K, respectively. The Pr3+ cations remain paramagnetic down to ~10 K and show no-long range order at 2 K. Both compounds show a large degree of hysteresis in M(H), with coercive fields of 3.79 kOe and 3.03 kOe at 2 K.

Journal Keywords: Magnetisation Reversal; Neutron Diffraction; Perovskite

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: Institut Laue-Langevin (ILL)

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