First-principles study of electronic structure and magnetic properties of SrTi1-xMxO3 （M = Cr, Mn, Fe, Co, or Ni）  

作　　者：Xin-Long Dong Kun-Hua Zhang Ming-Xiang Xu 

机构地区：[1]College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China [2]Department of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China [3]ICQD, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China

出　　处：《Frontiers of physics》2018年第5期119-125,共7页物理学前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （Grant No. 11747124）.

摘　　要：We used first-principles calculations to conduct a comparative study of the structure and the electronic and magnetic properties of SrTiO3 doped with a transition metal（TM）, namely, Cr, Mn, Fe, Co, or Ni. The calculated formation energies indicate that compared with Sr, Ti can be substituted more easily by the TM ions. The band structures show that SrTi0.875Cr0.125O3 and SrTi0.875Co0.125O3 are half metals, SrTio.sTDFe0.125O3 is a metal, and SrTi0.875Mn0.125O3 is a semiconductor. The 3d TM-doped SrTiO3 exhibits various magnetic properties, ranging from ferromagnetism （Cr-, Fe-, and Co-doped SrTiO3） to antiferromagnetism （Mn-doped SrTiO3） and nonmagnetism （Ni-doped SrTiO3）. The total magnetic moments are 4.0#8, 6.23μ8, and 2.0μ8 for SrTi0.75Cr0.25O3, SrTi0.75Fe0.25O3, and SrTi0.75Co0.25O3, respectively. Room-temperature ferromagnetism can be expected in Cr-, Fe-, and Co-doped SrTiO3, which agrees with the experimental observations. The electronic structure calculations show that the spin polarizations of the 3d states of the TM atoms are responsible for the ferromagnetism in these compounds. The magnetism of TM-doped SrTiO3 is explained by the hybridization between the TM-3d states and the O-2p states.We used first-principles calculations to conduct a comparative study of the structure and the electronic and magnetic properties of SrTiO3 doped with a transition metal（TM）, namely, Cr, Mn, Fe, Co, or Ni. The calculated formation energies indicate that compared with Sr, Ti can be substituted more easily by the TM ions. The band structures show that SrTi0.875Cr0.125O3 and SrTi0.875Co0.125O3 are half metals, SrTio.sTDFe0.125O3 is a metal, and SrTi0.875Mn0.125O3 is a semiconductor. The 3d TM-doped SrTiO3 exhibits various magnetic properties, ranging from ferromagnetism （Cr-, Fe-, and Co-doped SrTiO3） to antiferromagnetism （Mn-doped SrTiO3） and nonmagnetism （Ni-doped SrTiO3）. The total magnetic moments are 4.0#8, 6.23μ8, and 2.0μ8 for SrTi0.75Cr0.25O3, SrTi0.75Fe0.25O3, and SrTi0.75Co0.25O3, respectively. Room-temperature ferromagnetism can be expected in Cr-, Fe-, and Co-doped SrTiO3, which agrees with the experimental observations. The electronic structure calculations show that the spin polarizations of the 3d states of the TM atoms are responsible for the ferromagnetism in these compounds. The magnetism of TM-doped SrTiO3 is explained by the hybridization between the TM-3d states and the O-2p states.

关 键 词：first-principles calculations SRTIO3 electronic structure FERROMAGNETISM 

分 类 号：TQ138.11[化学工程—无机化工] O613.71[理学—无机化学]