Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany.
Phys Rev Lett. 2011 Jun 17;106(24):247202. doi: 10.1103/PhysRevLett.106.247202. Epub 2011 Jun 16.
Ultrasound and magnetization studies of bond-frustrated ZnCr(2)S(4) spinel are performed in static magnetic fields up to 18 T and in pulsed fields up to 62 T. At temperatures below the antiferromagnetic transition at T(N1)≈14 K, the sound velocity as a function of the magnetic field reveals a sequence of steps followed by plateaus indicating a succession of crystallographic structures with constant stiffness. At the same time, the magnetization evolves continuously with a field up to full magnetic polarization without any plateaus in contrast to geometrically frustrated chromium oxide spinels. The observed high-field magnetostructural states are discussed within a H-T phase diagram taking into account the field and temperature evolution of three coexisting spin structures and subsequent lattice transformations induced by the magnetic field.
在静态磁场高达 18 T 和脉冲磁场高达 62 T 的条件下，对受挫的 ZnCr(2)S(4)尖晶石进行了超声和磁化研究。在低于约 14 K 的反铁磁转变温度 T(N1)以下，声速随磁场的变化呈现出一系列阶跃，随后是平台，表明存在一系列具有恒定刚度的晶体结构。与此同时，与几何受挫的氧化铬尖晶石不同，磁化强度在磁场作用下连续演化，直至完全磁化，没有任何平台。在所提出的 H-T 相图中，考虑到三种共存自旋结构的场和温度演化以及磁场引起的随后的晶格转变，讨论了所观察到的高场磁结构状态。
