Magnetically driven loss of centrosymmetry in metallic Pb2CoOsO6

Abstract

We report magnetic, transport, neutron diffraction, and muon spin rotation data showing that Pb${}_2$CoOsO${}_6$, a newly synthesized metallic double-perovskite with a centrosymmetric space group at room temperature, exhibits a continuous second-order phase transition at 45 K to a magnetically ordered state with a non-centrosymmetric space group. The absence of inversion symmetry is very uncommon in metals, particularly metallic oxides. In contrast to the recently reported ferroelectric-like structural transition in LiOsO${}_3$, the phase transition in Pb${}_2$CoOsO${}_6$ is driven by a long-range collinear antiferromagnetic order, with propagation vector $\text{k}=(\frac{1}{2},0,\frac{1}{2})$, which relieves the frustration associated with the symmetry of themagnetic exchanges. This magnetically-driven loss of inversion symmetry represents a new frontier in the search for novel metallic behavior.

arXiv comment5 pages, 3 figures

References in corpus (18)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Skyrmion Lattice in a Chiral Magnet
• A ferroelectric-like structural transition in a metal
• Hybrid improper ferroelectricity in a Multiferroic and Magnetoelectric hybrid organic-inorganic perosvkite
• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• Theoretical aspects of Andreev spectroscopy and tunneling spectroscopy in non-centrosymmetric superconductors: a topical review
• Designing a robustly metallic noncenstrosymmetric ruthenate oxide with large thermopower anisotropy
• Lattice Instability and Competing Spin Structures in the Double Perovskite Insulator Sr2FeOsO6
• Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7
• Femtoscale magnetically induced lattice distortions in multiferroic TbMnO3
• Playing quantum hide-and-seek with the muon: localizing muon stopping sites
• Lattice-site-specific spin-dynamics in double perovskite Sr2CoOsO6
• An anisotropic local modification of crystal field levels in Pr-based pyrochlores: a muon-induced effect modelled using density functional theory
• Long-Range Magnetic Order in the 5d^2 Double Perovskite Ba2CaOsO6: Comparison with Spin-Disordered Ba2YReO6
• Magnetic order and electronic structure of 5d3 double perovskite Sr2ScOsO6
• Optical activity of noncentrosymmetric metals
• Spin-orbit coupling, strong correlation, and insulator-metal transitions: the J${}_{\mathrm{eff}}$ =3\2 ferromagnetic Mott insulator Ba${}_2$NaOsO${}_6$
• Mechanism of ferroelectric instabilities in non d^0 perovskites: LaCrO_3 versus CaMnO_3

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