Field induced incommensurate-to-commensurate magnetic phase transition in Ca3Co1.8Fe0.2O6: a neutron diffraction study

Yusuf, S. M. ; Jain, Anil ; Keller, L. (2013) Field induced incommensurate-to-commensurate magnetic phase transition in Ca3Co1.8Fe0.2O6: a neutron diffraction study Journal of Physics: Condensed Matter, 25 (14). Article ID 146001. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/article/10.1088/0953-898...

Related URL: http://dx.doi.org/10.1088/0953-8984/25/14/146001

Abstract

Neutron powder diffraction experiments have been performed to investigate the nature of magnetic ordering, as a function of temperature (1.5–100 K) and magnetic field (0, 2 and 4 T), in the compound Ca3Co1.8Fe0.2O6. In zero applied field, the compound orders magnetically in the incommensurate spin density wave (SDW) structure (TN ∼ 20 K). Under an applied field of ∼2 T, an incommensurate-to-commensurate magnetic phase transition has been observed. With a further increase in the magnetic field (∼4 T), the commensurate magnetic structure transforms into a ferrimagnetic structure. In zero applied field, magnetic short-range ordering (SRO) coexists with the SDW long-range ordering (LRO) at all temperatures below TN. In an applied magnetic field (2 and 4 T), SRO is converted into LRO only over the temperature range 12–20 K; however, below ∼12 K, an increase in the volume fraction of the SRO has been observed. The correlation length for the SRO (below ∼12 K) also gets affected by the application of a field.

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