Strongly disordered Heisenberg spin-1 chains : vanadium warwickites
Strongly disordered Heisenberg spin-1 chains : vanadium warwickites
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高度无序的海森堡自旋 1 链：钒沃威克石
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
P. R. Silva
中科院分区：
文献类型：
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作者：
M. Continentino;J. Fernandes;R. B. Guimarães;B. Boechat;H. Borges;J. Valarelli;E. Haanappel;A. Lacerda;P. R. Silva
摘要化合物MgVOBO3的结构特点是存在带状结构，其中自旋为1的V3+离子随机分布。我们提出了x射线，磁化率χ(T)作为温度和高场磁化测量m(H)（高达45 T）对粉末样品的函数。这些证据表明，在这个具有强无序磁链的系统中，存在任意的低能量激发，这些激发负责我们观察到的χ(T)和m(H)的幂律依赖性。我们发现它的磁性行为类似于无序的自旋1 / 2反铁磁链。我们对自旋为1的强无序反铁磁海森堡链的理论结果证实了实验结果。
Abstract The structure of the compound MgVOBO3 is characterized by the presence of ribbons where the spin-1 V3+ ions are randomly located. We present X-ray, susceptibility χ(T) as a function of temperature and high-field magnetization measurements m(H) (up to 45 T) on powdered samples. These give evidence that in this system, with strong disorder on the magnetic chains, there are arbitrarily low-energy excitations which are responsible for the power-law dependence of χ(T) and m(H) that we observe. We find that the magnetic behaviour is reminiscent of the disordered spin-½ antiferromagnetic chain. Our theoretical results for the strongly disordered spin-1 antiferromagnetic Heisenberg chain substantiate the experimental observations.