Abstract
We have measured the magnetization of single crystalline Sr3Fe2O6.5 with a lot of oxygen deficiencies. It was observed that the spin direction is parallel to the c-axis below TN. Moreover, we carried out neutron powder diffraction experiments with a Sr3Fe2O6.21 powder sample. The magnetic structure with a lot of oxygen deficiencies (δ > 0.5) has a typical Ising antiferromagnet system with the magnetic unit cell √2a × √2a × c. On the other hand, it was found that the magnetic structure of Sr3Fe2O6.94 with a few oxygen deficiencies is larger than that of 2a × 2a × 4c. The magnetic structure of Sr3Fe2O6.94 is obviously different from that of Sr3Fe2O7-δ (δ > 0.5). Such a difference in the magnetic structures is associated with a drastic change of the exchange interactions between Fe-spins due to the introduction of oxygen.
Original language | English |
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Journal | Applied Physics A: Materials Science and Processing |
Volume | 74 |
Issue number | SUPPL.I |
DOIs | |
Publication status | Published - 2002 Dec 1 |
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)