Re-entrant spin-glass behaviour of geometrically frustrated SrFe<sub>3</sub>(PO<sub>4</sub>)<sub>3</sub>O
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説明
Four anomalies of magnetic origin were observed at T1 = 10. 7K ,T2 = 11. 7K , Tf = 22. 4K , andTc = 23.5 K in SrFe3(PO4)3O with a geometrically frustrated magnetic lattice using different techniques. SrFe3(PO4)3 Os hows features typical of re-entrant spin glass with the freezing temperature Tf in zero static magnetic field and the Curie temperature Tc. These features are the sharp upturn of the dc magnetization and ferromagnetic hysteresis loops on the M(H ) curves below Tc, frequency-dependent rounded maxima on both the χ � (T ) and χ �� (T ) curves at different positions, a very small anomaly of specific heat at Tf, and strong suppression of spin-glass behaviour by magnetic fields above 0.1 T. High-field magnetization measurements revealed the existence of a 1/3magnetization plateau above 25 T at T = 1.7 K. Magnetic reflections were observed below Tc on neutron powder diffraction patterns. Additional magnetic reflections appeared below T2. (Some figures in this article are in colour only in the electronic version)
収録刊行物
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- Journal of Physics: Condensed Matter
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Journal of Physics: Condensed Matter 19 145221-, 2007-03-23
IOP Publishing
