Geometry-driven polar antiferromagnetic metallicity in a double-layered perovskite cobaltate
Source abstract
Abstract
The coexistence of structural polarity and magnetism within a single material can give rise to coupled electromagnetic states, such as those observed in multiferroics. Unlike widely studied insulating polar materials, polar magnetic metals host unique coupling among their symmetry-breaking lattice distortions, spin order and intrinsic conductivity, offering a unique platform for emergent magnetotransport phenomena. Here we report a polar antiferromagnetic metallic state in the double-layered Ruddlesden-Popper perovskite Sr3Co2O7. The cobalt ions at different sublayers develop inequivalent ionic displacements, geometrically generating a polar state while preserving metallic conductivity. Furthermore, the quasi-two-dimensional crystalline architecture hosts an A-type antiferromagnetic order with the Néel vector along the c axis, stabilized by interlayer hybridization of Co-d orbitals. Strikingly, despite negligible remanent magnetization, we observe a notable zero-field anomalous Hall conductivity, ascribed to the coupling between antiferromagnetism and polarity. This work highlights the pivotal role of symmetry engineering and geometric distortion in layered perovskites for designing multifunctional quantum materials.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (58)
Show source-provided references
1. Anderson, P. W. & Blount, E. I. Symmetry considerations on martensitic transformations: "ferroelectric" metals? Phys. Rev. Lett. 14, 217 (1965).10.1103/PhysRevLett.14.217 ↗
2. Shi, Y. et al. A ferroelectric-like structural transition in a metal. Nat. Mater. 12, 1024–1027 (2013).10.1038/nmat3754 ↗
3. Kim, T. H. et al. Polar metals by geometric design. Nature 533, 68–72 (2016).10.1038/nature17628 ↗
4. Balachandran, P. V., Young, J., Lookman, T. & Rondinelli, J. M. Learning from data to design functional materials without inversion symmetry. Nat. Commun. 8, 14282 (2017).10.1038/ncomms14282 ↗
5. Lu, J. et al. Ferroelectricity with asymmetric hysteresis in metallic LiOsO3 ultrathin films. Phys. Rev. Lett. 122, 227601 (2019).10.1103/PhysRevLett.122.227601 ↗
6. Fang, Y. & Chen, H. Design of a multifunctional polar metal via first-principles high-throughput structure screening. Commun. Mater. 1, 1 (2020).10.1038/s43246-019-0005-6 ↗
7. Lei, S. et al. Observation of quasi-two-dimensional polar domains and ferroelastic switching in a metal, Ca3Ru2O7. Nano Lett. 18, 3088–3095 (2018).10.1021/acs.nanolett.8b00633 ↗
8. Bhowal, S. & Spaldin, N. A. Polar metals: principles and prospects. Ann. Rev. Mater. Res. 53, 53–79 (2023).10.1146/annurev-matsci-080921-105501 ↗
9. Junquera, J. et al. Topological phases in polar oxide nanostructures. Rev. Mod. Phys. 95, 025001 (2023).10.1103/RevModPhys.95.025001 ↗
10. Tokura, Y. & Nagaosa, N. Nonreciprocal responses from non-centrosymmetric quantum materials. Nat. Commun. 9, 3740 (2018).10.1038/s41467-018-05759-4 ↗
11. Ideue, T. et al. Bulk rectification effect in a polar semiconductor. Nat. Phys. 13, 578–583 (2017).10.1038/nphys4056 ↗
12. Fei, Z. et al. Ferroelectric switching of a two-dimensional metal. Nature 560, 336–339 (2018).10.1038/s41586-018-0336-3 ↗
13. Wang, X. et al. Interfacial ferroelectricity in rhombohedral-stacked bilayer transition metal dichalcogenides. Nat. Nanotechnol. 17, 367–371 (2022).10.1038/s41565-021-01059-z ↗
14. Spaldin, N. A. & Ramesh, R. Advances in magnetoelectric multiferroics. Nat. Mater. 18, 203–212 (2019).10.1038/s41563-018-0275-2 ↗
15. Ramesh, R. & Spaldin, N. A. Multiferroics: progress and prospects in thin films. Nat. Mater. 6, 21–29 (2007).10.1038/nmat1805 ↗
16. Yoshimi, R. et al. Current-driven magnetization switching in ferromagnetic bulk Rashba semiconductor (Ge,Mn)Te. Sci. Adv. 4, eaat9989 (2018).10.1126/sciadv.aat9989 ↗
17. Zhang, H. et al. Room-temperature skyrmion lattice in a layered magnet (Fe0.5Co0.5)5GeTe2. Sci. Adv. 8, eabm7103 (2022).10.1126/sciadv.abm7103 ↗
18. Zhang, H. et al. A room temperature polar magnetic metal. Phys. Rev. Mater. 6, 044403 (2022).10.1103/PhysRevMaterials.6.044403 ↗
19. Zhang, J. et al. A correlated ferromagnetic polar metal by design. Nat. Mater. 23, 912–919 (2024).10.1038/s41563-024-01856-6 ↗
20. Peng, W. et al. Flexoelectric polarizing and control of a ferromagnetic metal. Nat. Phys. 20, 450–455 (2024).10.1038/s41567-023-02333-8 ↗
21. Song, Q. et al. Antiferromagnetic metal phase in an electron-doped rare-earth nickelate. Nat. Phys. 19, 522–528 (2023).10.1038/s41567-022-01907-2 ↗
22. Cao, G., McCall, S., Crow, J. E. & Guertin, R. P. Observation of a metallic antiferromagnetic phase and metal to nonmetal transition in Ca3Ru2O7. Phys. Rev. Lett. 78, 1751 (1997).10.1103/PhysRevLett.78.1751 ↗
23. Manchon, A. et al. Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems. Rev. Mod. Phys. 91, 035004 (2019).10.1103/RevModPhys.91.035004 ↗
24. Šmejkal, L., Sinova, J. & Jungwirth, T. Beyond conventional ferromagnetism and antiferromagnetism: a phase with nonrelativistic spin and crystal rotation symmetry. Phys. Rev. X 12, 031042 (2022).
25. Šmejkal, L., Sinova, J. & Jungwirth, T. Emerging research landscape of altermagnetism. Phys. Rev. X 12, 040501 (2022).
26. Cheong, S. W. & Huang, F. T. Altermagnetism with non-collinear spins. npj Quantum Mater. 9, 13 (2024).10.1038/s41535-024-00626-6 ↗
27. Krempasky, J. et al. Altermagnetic lifting of Kramers spin degeneracy. Nature 626, 517 (2024).10.1038/s41586-023-06907-7 ↗
28. Chen, H., Niu, Q. & MacDonald, A. H. Anomalous Hall effect arising from noncollinear antiferromagnetism. Phys. Rev. Lett. 112, 017205 (2014).10.1103/PhysRevLett.112.017205 ↗
29. Zhu, Y. P. et al. Observation of plaid-like spin splitting in noncoplanar antiferromagnet. Nature 626, 523 (2024).10.1038/s41586-024-07023-w ↗
30. Feng, Z. et al. An anomalous Hall effect in altermagnetic ruthenium dioxide. Nat. Electron. 5, 735–743 (2022).10.1038/s41928-022-00866-z ↗
31. Wang, M. et al. Emergent zero-field anomalous Hall effect in a reconstructed rutile antiferromagnetic metal. Nat. Commun. 14, 8240 (2023).10.1038/s41467-023-43962-0 ↗
32. Gonzales Betancourt, R. D. et al. Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor. Phys. Rev. Lett. 130, 036702 (2023).10.1103/PhysRevLett.130.036702 ↗
33. Amin, O. J. et al. Nanoscale imaging and control of altermagnetism in MnTe. Nature 636, 348 (2024).10.1038/s41586-024-08234-x ↗
34. Zhou, Z. Y. et al. Manipulation of the altermagnetic order in CrSb via crystal symmetry. Nature 638, 645 (2025).10.1038/s41586-024-08436-3 ↗
35. Princep, A. J. et al. Magnetically driven loss of centrosymmetry in metallic Pb2CoOsO6. Phys. Rev. B 102, 104410 (2020).10.1103/PhysRevB.102.104410 ↗
36. Moritomo, Y., Asamitsu, A., Kuwahara, H. & Tokura, Y. Giant magnetoresistance of manganese oxides with a layered perovskite structure. Nature 380, 141–144 (1996).10.1038/380141a0 ↗
37. Benedek, N. A. & Fennie, C. J. Hybrid improper ferroelectricity: a mechanism for controllable polarization-magnetization coupling. Phys. Rev. Lett. 106, 107204 (2011).10.1103/PhysRevLett.106.107204 ↗
38. Pitcher, M. J. et al. Tilt engineering of spontaneous polarization and magnetization above 300 K in a bulk layered perovskite. Science 347, 420–424 (2015).10.1126/science.1262118 ↗
39. Smith, K. A. et al. Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7. Nat. Commun. 10, 5235 (2019).10.1038/s41467-019-13066-9 ↗
40. Lee, C. H. et al. Exploiting dimensionality and defect mitigation to create tunable microwave dielectrics. Nature 502, 532–536 (2013).10.1038/nature12582 ↗
41. Sun, H. et al. Signatures of superconductivity near 80 K in a nickelate under high pressure. Nature 621, 493–498 (2023).10.1038/s41586-023-06408-7 ↗
42. Sokolov, D. A. et al. Metamagnetic texture in a polar antiferromagnet. Nat. Phys. 15, 671–677 (2019).10.1038/s41567-019-0501-0 ↗
43. Wang, Y. et al. Robust ferromagnetism in highly strained SrCoO3 thin films. Phys. Rev. X 10, 021030 (2020).
44. Matsuno, J. et al. Metallic ferromagnet with square-lattice CoO2 sheets. Phys. Phys. Lett. 93, 167202 (2004).10.1103/PhysRevLett.93.167202 ↗
45. Nagaosa, N., Sinova, J., Onoda, S., MacDonald, A. H. & Ong, N. P. Anomalous Hall effect. Rev. Mod. Phys. 82, 1539 (2010).10.1103/RevModPhys.82.1539 ↗
46. Ohuchi, Y. et al. Topological Hall effect in thin films of the Heisenberg ferromagnet EuO. Phys. Rev. B 91, 245115 (2015).10.1103/PhysRevB.91.245115 ↗
47. Liang, D., DeGrave, J. P., Stolt, M. J., Tokura, Y. & Jin, S. Current-driven dynamics of skyrmions stabilized in MnSi nanowires revealed by topological Hall effect. Nat. Comm. 6, 8217 (2015).10.1038/ncomms9217 ↗
48. Gao, A. et al. Layer Hall effect in a 2D topological axion antiferromagnet. Nature 595, 521–525 (2021).10.1038/s41586-021-03679-w ↗
49. Pelloquin, D., Barrier, N., Maignan, A. & Caignaert, V. Reactivity in air of the Sr3Co2O7−δ RP=2 phase: formation of the hydrated Sr3Co2O5(OH)2.xH2O cobaltite. Solid State Sci. 7, 853–860 (2005).10.1016/j.solidstatesciences.2005.01.023 ↗
50. Guo, J. W. et al. Strain-induced ferroelectricity and spin–lattice coupling in SrMnO3 thin films. Phys. Rev. B 97, 235135 (2018).10.1103/PhysRevB.97.235135 ↗
51. De Backer, A., Van den Bos, K., Van den Broek, W., Sijbers, J. & Van Aert, S. StatSTEM: An efficient approach for accurate and precise model-based quantification of atomic resolution electron microscopy images. Ultramicroscopy 171, 104–116 (2016).10.1016/j.ultramic.2016.08.018 ↗
52. Kresse, G. & Hafner, J. Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium. Phys. Rev. B 49, 14251 (1994).10.1103/PhysRevB.49.14251 ↗
53. Perdew, J. P., Burke, K. & Ernzerhof, M. Generalized gradient approximation made simple. Phys. Rev. Lett. 77, 3865 (1996).10.1103/PhysRevLett.77.3865 ↗
54. Monkhorst, H. J. & Pack, J. D. Special points for Brillouin-zone integrations. Phys. Rev. B 13, 5188 (1976).10.1103/PhysRevB.13.5188 ↗
55. Dudarev, S. L., Botton, G. A., Savrasov, S. Y., Humphreys, C. J. & Sutton, A. P. Electron-energy-loss spectra and the structural stability of nickel oxide: an LSDA+U study. Phys. Rev. B 57, 1505 (1998).10.1103/PhysRevB.57.1505 ↗
56. Gerber, A. Interpretation of experimental evidence of the topological Hall effect. Phys. Rev. B 98, 214440 (2018).10.1103/PhysRevB.98.214440 ↗
57. Wang, H. et al. Topological Hall transport: materials, mechanisms and potential applications. Prog. Mater. Sci. 130, 100971 (2022).10.1016/j.pmatsci.2022.100971 ↗
58. Avci, C. O. et al. Current-induced switching in a magnetic insulator. Nat. Mater. 16, 309–314 (2017).10.1038/nmat4812 ↗