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Instruments / Technical Area	Publication Details	Published	Actions
	Magnetocapacitance effect and magnetoelectric coupling in type-II multiferroic HoFeWO6 Moein Adnani , Melissa Gooch , Liangzi Deng , Stefano Agrestini , Javier Herrero-Martin , Hung-Cheng Wu , Chung-Kai Chang , Taha Salavati-Fard , Narayan Poudel , Jose Luis Garcia-Munoz , Samira Daneshmandi , Zheng Wu , Lars C. Grabow , Yen-Chung Lai , Hung-Duen Yang , Eric Pellegrin , Ching-Wu Chu Physical Review B 103 DOI: 10.1103/PhysRevB.103.094110 Show Abstract ▼ Abstract: We have investigated the multiferroicity and magnetoelectric (ME) coupling in Ho Fe W O 6 . With a noncentrosymmetric polar structure (space group Pna 2 1 ) at room temperature, this compound shows an onset of electric polarization with an antiferromagnetic ordering at the Néel temperature ( T N ) of 17.8 K. The magnetic properties of the polycrystalline samples were studied by DC and AC magnetization and heat capacity measurements. The metamagnetic behavior at low temperatures was found to be directly related to the dielectric properties of the compound. In particular, field-dependent measurements of capacitance show a magnetocapacitance (MC) effect with double-hysteresis loop behavior in direct correspondence with the magnetization. Our x-ray diffraction results show the Pna 2 1 structure down to 8 K and suggest the absence of a structural phase transition across T N . Soft x-ray absorption spectroscopy and soft x-ray magnetic circular dichroism (XMCD) measurements at the Fe L 2 , 3 and Ho M 4 , 5 edges revealed the oxidation state of Fe and Ho cations to be 3 + . Fe L 2 , 3 XMCD further shows that Fe 3 + cations are antiferromagnetically ordered in a noncollinear fashion with spins arranged 90 ∘ with respect to each other. Our findings show that Ho Fe W O 6 is a type-II multiferroic exhibiting a MC effect. The observed MC effect and the change in polarization by the magnetic field, as well as their direct correspondence with magnetization, further support the strong ME coupling in this compound.	Mar 2021
I11-High Resolution Powder Diffraction I19-Small Molecule Single Crystal Diffraction	Improper ferroelectric polarization in a perovskite driven by intersite charge transfer and ordering Wei-Tin Chen , Chin-Wei Wang , Hung-Cheng Wu , Fang-Cheng Chou , Hung-Duen Yang , Arkadiy Simonov , M. S. Senn Physical Review B 97 DOI: 10.1103/PhysRevB.97.144102 Diamond Proposal Number(s): [13284, 13639, 15920] Open Access Show Abstract ▼ Abstract: It is of great interest to design and make materials in which ferroelectric polarization is coupled to other order parameters such as lattice, magnetic, and electronic instabilities. Such materials will be invaluable in next-generation data storage devices. Recently, remarkable progress has been made in understanding improper ferroelectric coupling mechanisms that arise from lattice and magnetic instabilities. However, although theoretically predicted, a compact lattice coupling between electronic and ferroelectric (polar) instabilities has yet to be realized. Here we report detailed crystallographic studies of a perovskite HgAMn A′ 3Mn B 4O12 that is found to exhibit a polar ground state on account of such couplings that arise from charge and orbital ordering on both the A′- and B-sites, which are themselves driven by a highly unusual MnA′−MnB intersite charge transfer. The inherent coupling of polar, charge, orbital, and hence magnetic degrees of freedom make this a system of great fundamental interest, and demonstrating ferroelectric switching in this and a host of recently reported hybrid improper ferroelectrics remains a substantial challenge.	Apr 2018

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