Magnetic-field induced transition to the 1/2 magnetization plateau state in the geometrically frustrated magnet CdCr2O4.
Magnetic-field induced transition to the 1/2 magnetization plateau state in the geometrically frustrated magnet CdCr2O4.
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DOI：
10.1103/physrevlett.94.047202
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发表时间：
2005-02
影响因子：
8.6
通讯作者：
H. Ueda;H. Katori;H. Mitamura;T. Goto;H. Takagi
中科院分区：
文献类型：
--
作者：
H. Ueda;H. Katori;H. Mitamura;T. Goto;H. Takagi
在高达47 T的脉冲磁场中测量了几何阻挫尖晶石CdCr 2 O 4的磁化强度。我们发现了一个变磁过渡到一个非常宽的磁化平台状态的一半的完整的时刻S=3/2 Cr 3+在28 T，独立的磁场方向。这是在海森堡烧绿石磁体中首次观察到磁化平台态。平台状态可以归因于一个共线的自旋配置与三个向上和一个向下的自旋出每个铬四面体的四个自旋。尽管自旋-轨道耦合可以忽略不计，但在转变处观察到大的磁致伸缩。我们认为，自旋挫折起着至关重要的作用，在这个大的自旋晶格耦合。
The magnetization of the geometrically frustrated spinel CdCr2O4 was measured in pulsed fields of up to 47 T. We found a metamagnetic transition to a very wide magnetization plateau state with one half of the full moment of S=3/2 Cr3+ at 28 T, independent of the field direction. This is the first observation of magnetization plateau state realized in Heisenberg pyrochlore magnet. The plateau state can be ascribed to a collinear spin configuration with three-up and one-down spins out of four spins of each Cr tetrahedron. A large magnetostriction is observed at the transition in spite of the negligible spin-orbit couplings. We argue that spin frustration plays a vital role in this large spin-lattice coupling.