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首页> 外文期刊>Physica, B. Condensed Matter >Possible magnetic ground state of the half doped perovskite compound R0.5Ce0.5CoO3 (R=Ca, Sr)
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Possible magnetic ground state of the half doped perovskite compound R0.5Ce0.5CoO3 (R=Ca, Sr)

机译:半掺杂钙钛矿化合物R0.5Ce0.5CoO3(R = Ca,Sr)的可能的磁性基态

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摘要

By using the unrestricted Hartree-Fock approximation and the real-space recursion method, we have investigated various magnetic structures in an enlarged double cell of the half doped compound R0.5Ce0.5CoO3 (R=Ca, Sr). These include the low-spin state (LS : t(2g)(5)e(g)(1)), the intermediate-spin state (IS : t(2g)(4.5)e(g)(1.5)), and the high-spin state (HS : t(2g)(4)e(g)(2)) as well as all possible combinations among these three states. The densities of states are computed and stabilities of various states are analyzed as functions of the model parameters. For a fixed Hund's coupling j, it is shown that the ground state of R0.5Ce0.5CoO3 (R=Ca, Sr) transforms from the antiferromagnetic high-spin state to the ferromagnetically ordered high-spin low-spin state as the crystal-field splitting Dq increases.
机译:通过使用不受限制的Hartree-Fock逼近和实空间递归方法,我们研究了半掺杂化合物R0.5Ce0.5CoO3(R = Ca,Sr)的扩大双晶胞中的各种磁性结构。这些包括低自旋状态(LS:t(2g)(5)e(g)(1)),中自旋状态(IS:t(2g)(4.5)e(g)(1.5)),以及高旋转状态(HS:t(2g)(4)e(g)(2))以及这三种状态之间的所有可能组合。根据模型参数计算状态的密度,并分析各种状态的稳定性。对于固定的洪德耦合j,表明R0.5Ce0.5CoO3(R = Ca,Sr)的基态从反铁磁高自旋态转变为铁磁有序高自旋低自旋态,其晶体为场分裂Dq增加。

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