Orbital Hybridization Induced by Double‐Anion Coordination to Enhance Room‐Temperature Ferromagnetic Response. Issue 5 (2nd March 2022)

• Record Type: Journal Article
• Authors: Wu, Liqian; Liu, Lizhe; Guo, Jiajun; Chen, Qiang; Wang, Dunhui
• Is Part Of: Physica status solidi. Volume 16:Issue 5(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-02
• Subjects: cobalt selenides -- magnetic structure transformation -- orbital hybridization -- oxygen introduction -- room-temperature ferromagnetism; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202100553
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The oxygen introduction is expected to enable manipulation of material properties, however, the coordination mechanism between oxygen and other nonmetal dopants remains inadequate. Herein, the oxygen introduction into cobalt selenides has been achieved through annealing in a controlled gas environment to disclose the anion defects formation process. Superconducting quantum interference device (SQUID) measurements indicate that the cobalt selenides annealed exhibit significantly enhanced room‐temperature ferromagnetism. Calculations reveal that the magnetic improvement is mainly attributed to orbital hybridization induced by double‐anion coordination (selenium and oxygen). This work can provide new insight into the role of oxygen incorporation in magnetic structure transformation. Abstract : The oxygen introduction can strongly affect magnetic structure, and significantly enhance room‐temperature magnetic response for cobalt selenides. The difference in bonding interaction between CoO bonds and CoSe bonds induces electronic reconfiguration in cobalt selenides, altering room‐temperature ferromagnetism. This experimental observation can provide a new insight into the role of oxygen incorporation onto magnetic structure transformation.