Metallic and nonmetallic double perovskites:: A case study of A2FeReO6 (A = Ca, Sr, Ba)

被引:133
作者
Gopalakrishnan, J [1 ]
Chattopadhyay, A
Ogale, SB
Venkatesan, T
Greene, RL
Millis, AJ
Ramesha, K
Hannoyer, B
Marest, G
机构
[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
[2] Univ Maryland, Ctr Superconduct Res, Dept Phys, College Pk, MD 20742 USA
[3] Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08854 USA
[4] Univ Rouen, Lab Anal Spectroscop & Traitement Surface Mat, F-76821 Mt St Aignan, France
[5] Inst Phys Nucl, IN2P3, F-69622 Villeurbanne, France
[6] Univ Lyon 1, F-69622 Villeurbanne, France
来源
PHYSICAL REVIEW B | 2000年 / 62卷 / 14期
关键词
D O I
10.1103/PhysRevB.62.9538
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated the structure and electronic properties of ferrimagnetic double perovskites, A(2)FeReO(6) (A = Ca, Sr, Ba). The A = Ba phase is cubic (Fm3m) and metallic, while the A = Ca phase is monoclinic (P2(1) /n) and nonmetallic. Fe-57 Mossbauer spectroscopy shows that iron is present mainly in the high spin (S = 5/2) Fe3+ state in the Ca compound, while it occurs in an intermediate state between high spin Fe2+ and Fe3+ in the Ba compound. It is argued that a direct Re t(2g) - Re t(2g) interaction is the main cause for the metallic character of the Ba compound; the smaller size of Ca and the monoclinic distortion (which lifts the degeneracy of t(2g) states) seem to disrupt the Re-Re interaction in the case of the Ca compound, making it nonmetallic for the same electron count.
引用
收藏
页码:9538 / 9542
页数:5
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