Journal
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
Volume 23, Issue 4, Pages 413-419Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2013.06.012
Keywords
Fe2TiO5; Magnetic properties; Electronic structures; Optical properties; LSDA plus U
Funding
- National Natural Science Foundation of China
- Aviation Science Foundation [2011ZF51062]
- Program for New Century Excellent Talents in University (NCET)
- Innovation Foundation of BUAA [501RBYT2012101002]
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The magnetic properties, band structure, density of states (DOS) and optical properties of ferromagnetic Fe2TiO5 were calculated by a plane wave pseudopotential method based on the local spin density approximation (LSDA) and the LSDA plus Hubbard U (LSDA+U) theory and compared with the known experimental and theoretical results. By choosing the opportune Hubbard U parameter 4 eV, LSDA+U gives magnetic moments of 3.80 mu B/Fe (3d orbital), which contribute the main magnetic moments to Fe2TiO5. The inclusion of U changes the band gap of Fe2TiO5 and gives a value in better agreement with previous experiment. We find that strong correlations dramatically change the density of states and band structures. A detailed analysis shows that the LSDA+U method provides the better description of electronic structures like this system. Series optical properties were explored also. There is no ab-initio study related to Fe2TiO5 at present. These findings provide good theoretical understanding for Fe2TiO5. (c) 2013 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.
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