TEMPERATURE DEPENDENCES OF MAGNETIZATION AND SPIN-WAVES IN MNP
TEMPERATURE DEPENDENCES OF MAGNETIZATION AND SPIN-WAVES IN MNP
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DOI：
10.1143/jpsj.47.491
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发表时间：
1979-01-01
影响因子：
1.7
通讯作者：
KASUYA, T
中科院分区：
文献类型：
--
作者：
TAKASE, A;KASUYA, T
在4.2 ~ 280 K温度范围内测量了MnP铁磁相易轴磁化强度的温度关系，测量精度为ΔM/M<±5 ×10- 4。与通常的T3/2定律不同，TlnT依赖性高达约Tc/2。以下自旋波色散预计存在于0 K;沿着a轴，它几乎是恒定的，直到qa = Q，并非常迅速地增加超过Q，其中Q是螺旋传播矢量，而垂直于a轴，它是qa的平方。在有限温度下，计算的双磁振子重正化引起qa ~ qq附近磁振子能量的增加，导致MnP磁化强度下降的反常抑制。铁螺相变似乎也是由于这种效果。
The temperature dependence of the easy axis magnetization in the ferromagnetic phase of MnP is measured to an accuracy ofΔM/M<±5 ×10-4over a range from 4.2 K to 280 K. Instead of the usualT3/2law,TlnTdependence holds up to aboutTc/2. The following spin wave dispersion is expected to exsist at 0 K; along theaaxis it is nearly constant up toqa=Qand increases very rapidly beyondQ, whereQis the screw propagation vector, while for perpendicular to theaaxis it is quadratic inq⊥. At a finite temperature, the calculated two-magnon renormalization causes increase of the magnon energy nearqa∼Qwhich induces an anomalous suppression for decrease of magnetization in MnP. The ferro-screw phase transition seems also to be due to this effect.