期刊
PHYSICAL REVIEW B
卷 62, 期 21, 页码 14157-14163出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.14157
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High-resolution and magnetic neutron-diffraction measurements were performed to investigate the crystal and magnetic structures of bilayered FeOCl and polyaniline-intercalated FeOCl. A quasi-two-dimensional crystallographic structure, where charge neutral (Fe2O2Cl2)(n) lamellas are weakly linked via Van der Waals interactions, has made FeOCl a good host for accommodating guest molecules. A three-dimensional long-range ordering of the Fe spins in FeOCl develops below 80 K, with a magnetic unit cell 28 times the size of the nuclear one. A spiral magnetic structure was obtained, reflecting the competition between antiferromagnetic superexchange coupling and ferromagnetic direct exchange coupling. Polyaniline intercalation interrupts the magnetic correlations between the neighboring bilayers, rendering a coupled-bilayer quasi-two-dimensional magnetic order for the Fe spins in (C6D4ND)(0.16)FeOCl, No significant change on the ordering temperature of the Fe spins by the intercalation reaction was observed.
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