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- W2095476661 abstract "Abstract The crystal and magnetic structures of SrFe 2+ 2 (PO 4 ) 2 have been determined by neutron powder diffraction data at low temperatures (space group P 2 1 / c (no. 14); Z =4; a =9.35417(13) A, b =6.83808(10) A, c =10.51899(15) A, and β =109.5147(7)° at 15 K). Two magnetic phase transitions were found at T 1 =7.4 K (first-order phase transition) and T 2 =11.4 K (second-order phase transition). The transition at T 2 was hardly detectable by dc and ac magnetization measurements, and a small anomaly was observed by specific heat measurements. At T 1 , strong anomalies were found by dc and ac magnetization and specific heat. The structure of SrFe 2 (PO 4 ) 2 consists of linear four-spin cluster units, Fe2–Fe1–Fe1–Fe2. Below T 1 , the propagation vector of the magnetic structure is k =[0,0,0]. The magnetic moments of the inner Fe1–Fe1 atoms of the four-spin cluster unit are ferromagnetically coupled. The magnetic moment of the outer Fe2 atom is also ferromagnetically coupled with that of the Fe1 atom but with spin canting. The four-spin cluster units form ferromagnetic layers parallel to the [−101] plane, while these layers are stacked antiferromagnetically in the [−101] direction. Spin canting of the outer Fe2 atoms provides a weak ferromagnetic moment of about 1 μ B along the b -axis. The refined magnetic moments at 3.5 K are 4.09 μ B for Fe1 and 4.07 μ B for Fe2. Between T 1 and T 2 , a few weak magnetic reflections were observed probably due to incommensurate magnetic order." @default.
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- W2095476661 date "2008-09-01" @default.
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- W2095476661 title "Neutron powder diffraction study of the magnetic and crystal structures of SrFe2(PO4)2" @default.
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- W2095476661 doi "https://doi.org/10.1016/j.jssc.2008.05.031" @default.
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