Neutron polarization analysis of nanostructured ZnFe2O4

Fei, Y.; Kennedy, S.J.; Campbell, S. J.; Hofmann, M.

doi:10.1016/j.physb.2004.10.088

Cited by 1 publication

(1 citation statement)

References 18 publications

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“…The magnetic diffuse scattering results proposed a spin liquid state, analogous to the three-dimensional (3D) quantum spin liquid system, Y(Sc)Mn 2 , which was attributed to the strong magnetic frustration [34,35]. For the dominant short-range order (SRO), preferably, the existence of a ferromagnetic (FM) cluster has been proposed in nanoscale ZFO from neutron polarization studies [36]. In fact, a dominant SRO has been proposed from the neutron diffraction studies of a ZFO crystal, which was suggested to occur around 10 times (∼105 K) for T N at 10.5 K, and also proposed to exist a SRO state even below T N [25].…”

Section: Introductionmentioning

confidence: 99%

Rhombohedral distortion-driven ferroelectric order and exchange bias effect in geometrically frustrated ZnFe2O4

Dey

Chatterjee

Dippel

et al. 2021

Phys. Rev. Materials

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The rhombohedral distortion-driven occurrence of the spontaneous electric polarization at a reasonably high temperature (T ) and an exchange bias (EB) effect below the antiferromagnetic (AFM) Néel temperature (T N ) are revealed in ZnFe 2 O 4 . We observe the magnetic memory effect, suggesting a cooperative glassy magnetic state below T N . The phase separation between the long-range AFM and the glassy magnetic component leads to the EB effect below T N . The synchrotron diffraction studies confirm a structural transition to a polar R3m structure from the cubic spinel structure, involving a strong rhombohedral distortion. This distortion correlates with the occurrence of the spontaneous electric polarization (P) below ∼110 K (T FE1 ), which is accompanied by a short-range order (SRO). The P-value enhances further due to an additional rhombohedral distortion below T N . A considerable magnetoelectric (ME) coupling is detected below T FE1 . The increase of P is ∼7.2% for 5 T at the liquid nitrogen temperature. There has been a fundamental interest among the community in the unique result of the occurrence of ferroelectric (FE) order coexisting with SRO and having a significant ME coupling, which is accompanied by a strong rhombohedral structural distortion analogous to that observed in BiFeO 3 .

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