Quantum jumps in the magnetization of a magnet with antiferromagnetic impurities

被引:1
|
作者
Lagutin, AS [1 ]
Semeno, A [1 ]
Vanacken, J [1 ]
Bruynseraede, Y [1 ]
机构
[1] Katholieke Univ Leuven, Lab Vaste Stoffys & Magnetisme, B-3001 Louvain, Belgium
关键词
D O I
10.1103/PhysRevB.64.184415
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The differential magnetic susceptibility of GdxY3-xFe5O12 (0.01 < x < 0.2) polycrystalline compounds is studied in the temperature range 0.6 to 4.2 K and in pulsed magnetic fields up to 50 T. The magnetization of the compound with the lowest Gd content (x = 0.01) shows instead of a classical, a quantum (stepwise) phase transition to a completely saturated ferromagnetic phase at T = 0.6 K, in magnetic fields around 33 T. To explain these results, a Heisenberg ferrimagnetic model with weakly coupled antiferromagnetic impurities is used. Following this model, the nonequidistance of the energy levels of the impurity ions causes the occurrence of susceptibility oscillations under a variation of external magnetic fields.
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页数:5
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