The effect of Sr doping on the magnetic properties of Co perovskite

✍ Scribed by Min Zhuang; Weiyi Zhang; Tiejun Zhou; Naiben Ming

• Book ID: 104337344
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 197 KB
• Volume: 255
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00168-1

✦ Synopsis

Within the unrestricted Hartree-Fock approximation and the real space recursion method, we calculated the electronic Ž 6 0 . Ž structure of the La Sr CoO in whole doping range 0.0 F x F 1.0. The low-spin LS, t e , the intermediate-spin IS,

. t e , and the high-spin HS, t e states as well as their combinations in the doubled cell were taken as the initial 2 g g 2 g g Ž 6yx 0 . configurations. It is found that the system is a nonmagnetic low-spin state t e for x F 0.25 and a ferromagnetic 2 g g Ž 5 1yx . intermediate-spin state t e for 0.25 -x F 0.41. For 0.41 -x -0.95, the ground state of the system is a IS-HS 2 g g Ž 5 1yx 4 2yx . t e -t e nearest neighbor ferromagnetically ordered state, which is followed by the HS state up to x s 1.0. The 2 g g 2 g g ground state properties as a function of Sr doping are in accord with the experimental observations.