Evolution of magnetic and crystal structures in the multiferroic FeTe2O5Br

Abstract

Neutron diffraction and nuclear quadrupole resonance (NQR) measurements were employed to investigate magnetic order in the non-ferroelectric phase preceding the low-temperature multiferroic state in FeTe2O5Br. Refnement of the neutron diffraction data and simulations of 79,81Br NQR spectra reveal that the incommensurate magnetic ordering in the non-ferroelectric state comprises amplitude-modulated magnetic moments, similarly as in the multiferroic state. The two ordered states differ in the orientation of the magnetic moments and phase shifts between modulation waves. Surprisingly, all symmetry restrictions for the electric polarization are absent in both states. The different ferroelectric responses of the two states are thus argued to arise from the differences in the phase shifts between certain modulation waves, which cancel out in the non-ferrolectric state.

arXiv comment9 pages, 8 figures including appendix, published in PRB

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Cited by in corpus (5)

• Magnetic resonance as a local probe for kagomé magnetism in Barlowite Cu${}_4$(OH)${}_6$FBr
• Multiferroicity in the geometrically frustrated FeTe2O5Cl
• Role of Te in the low dimensional multiferroic material FeTe2O5Br
• Phase diagram of multiferroic KCu${}_3$As${}_2$O${}_7$(OD)${}_3$
• Competing magnetic phases in the frustrated spin-1/2 chain compound $\beta$-TeVO${}_4$ probed by NMR