A first-principles study on the electronic structure of one-dimensional [TM(Bz)]∞ polymer (TM= Y, Zr, Nb, Mo, and Tc) |
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Authors: | Fang Wu Richard Tjornhammar Er-jun Kan Zhen-yu Li |
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Institution: | 1. School of Science, Nanjing Forestry University, Nanjing, 210037, China 2. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China
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Abstract: | A systematic density functional theory (DFT) study has been performed to investigate the electronic and magnetic properties of one-dimensional sandwich polymers constructed with benzene (Bz) and the second-row transition metal (TM = Y, Zr, Nb, Mo, and Tc). Within the framework of generalized gradient approximation (GGA), Tc(Bz)]∞ is a ferromagnetic half-metal, and Nb(Bz)]∞ is a ferromagnetic metal. With the on-site Coulomb interaction for 4d TM atoms being taken into account, Tc(Bz)]∞ keeps a robust half-metallic behavior, while Nb(Bz)]∞ becomes a spin-selective semiconductor. The stability of the half-metallic Tc(Bz)]∞ polymer is discussed based on magnetic anisotropy energy (MAE). Compared with 0.1 meV per metal atom in Mn(Bz)]∞, the calculated MAE for Tc(Bz)]∞ is 2.3 meV per metal atom. Such a significantly larger MAE suggests that Tc(Bz)]∞ is practically more promising than its first-row TM equivalent. |
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