Gopalakrishnan, J. ; Chattopadhyay, A. ; Ogale, S. B. ; Venkatesan, T. ; Greene, R. L. ; Millis, A. J. ; Ramesha, K. ; Hannoyer, B. ; Marest, G. (2000) Metallic and nonmetallic double perovskites: a case study of A2 FeReO6(A= Ca, Sr, Ba) Physical Review B, 62 (14). pp. 9538-9542. ISSN 0163-1829
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.62.9538
Related URL: http://dx.doi.org/10.1103/PhysRevB.62.9538
Abstract
We have investigated the structure and electronic properties of ferrimagnetic double perovskites, A2FeReO6 (A=Ca, Sr, Ba). The A=Ba phase is cubic (Fm3m) and metallic, while the A=Ca phase is monoclinic (P21/n) and nonmetallic. 57Fe 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 Ret2g-Ret2g 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 t2g states) seem to disrupt the Re-Re interaction in the case of the Ca compound, making it nonmetallic for the same electron count.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 12825 |
| Deposited On: | 11 Nov 2010 08:49 |
| Last Modified: | 02 Jun 2011 10:59 |
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