title: Sc2NiMnO6: A Double-Perovskite with a Magnetodielectric Response Driven by Multiple Magnetic Orders.
abstract: Perovskite materials provide a large variety of interesting physical properties and applications. Here, we report on unique properties of a fully ordered magnetodielectric double-perovskite, Sc2NiMnO6 (space group P21/n, a = 4.99860 Å, b = 5.35281 Å, c = 7.34496 Å, and β = 90.7915°), exhibiting sequential magnetic transitions at T1 = 35 K and T2 = 17 K. The transition at T1 corresponds to a single-k antiferromagnetic phase with propagation vector k1 = (1/2, 0, 1/2), while the second transition at T2 corresponds to a 2-k magnetic structure with propagation vectors k1 = (1/2, 0, 1/2) and k2 = (0, 1/2, 1/2). Symmetry analysis suggests that the two ordering wave vectors are independent, and calculations imply that k1 is associated with the Mn sublattice and k2 with the Ni sublattice, suggesting that Mn-Ni coupling is very small or absent. A magnetodielectric anomaly at T2 likely arises from an antiferroelectric ordering that results from the exchange-striction between the two magnetic sublattices belonging to k1 and k2. The behavior of Sc2NiMnO6 demonstrates 3d double-perovskites with small A-site cations as a promising avenue in which to search for magnetoelectric materials.
authors.affiliation: †International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.|‡Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Yi
authors.affiliation: §Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Princep
authors.affiliation: §Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Guo
authors.affiliation: §Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.
authors.forename: Roger D
authors.initials: RD
authors.lastname: Johnson
authors.affiliation: ||ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Khalyavin
authors.affiliation: ||ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom.
authors.forename: Pascal
authors.initials: P
authors.lastname: Manuel
authors.affiliation: ⊥FRM-II, Technische Universität München, Garching 85747, Germany.
authors.forename: Anatoliy
authors.initials: A
authors.lastname: Senyshyn
authors.affiliation: #Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia.
authors.forename: Igor A
authors.initials: IA
authors.lastname: Presniakov
authors.affiliation: #Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 119992 Moscow, Russia.
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Sobolev
authors.affiliation: ∇Synchrotron X-ray Station at SPring-8, NIMS, Kohto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Matsushita
authors.affiliation: ∇Synchrotron X-ray Station at SPring-8, NIMS, Kohto 1-1-1, Sayo-cho, Hyogo 679-5148, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Tanaka
authors.affiliation: †International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Belik
authors.affiliation: §Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom.
authors.forename: Andrew T
authors.initials: AT
authors.lastname: Boothroyd