Temperature and doping-level dependence of magnetic order in La 2-x Sr x NiO 4+δ studied by muon spin rotation
Temperature and doping-level dependence of magnetic order in La 2-x Sr x NiO 4+δ studied by muon spin rotation
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DOI：
10.1103/physrevb.59.3775
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发表时间：
1999-02
影响因子：
3.7
通讯作者：
T. Jestädt;K. Chow;S. Blundell;W. Hayes;F. Pratt;B. Lovett;M. Green;J. E. Millburn;M. Rosseinsky
中科院分区：
文献类型：
--
作者：
T. Jestädt;K. Chow;S. Blundell;W. Hayes;F. Pratt;B. Lovett;M. Green;J. E. Millburn;M. Rosseinsky
我们报道了一系列锶掺杂浓度x在0到1之间的La2-xSrxNiO4+I‘化合物的Muon-Spin-Rotation(IOSR)测量结果。在所有被研究的样品中都发现了一个磁性相变，该相变发生在与组成有关的温度Tm。在Tm以下，对于所有的x，在零磁场中都观察到了明显的进动信号，这表明在长于10-8 S的时间尺度上至少存在短程磁序。在Tm以上，磁关联时间减少了几个数量级。在x？？0.33时，我们在TM和零温交错磁化强度中都发现了峰值，我们将其归因于在该掺杂水平下空穴的局域化程度较高。T_m作为x的函数的测量扩展了以前的中子衍射和I_(？)SR测量所确定的Na？el温度。©1999美国物理学会。
We report muon-spin-rotation (I¼SR) measurements on a series of compounds with composition La2-xSrxNiO4+I´ with strontium doping level x between 0 and 1. A magnetic transition is found in all the samples studied, which occurs at a composition-dependent temperature, TM. Below TM clear precession signals are observed in zero applied magnetic field for all x, indicating the existence of at least short-range magnetic order on a time scale longer than 10-8 s. Above TM the magnetic correlation times decrease by several orders of magnitude. At xâ??0.33, we find peaks in both TM and the zero-temperature staggered magnetization, an observation which we attribute to the higher degree of localization of the holes at this doping level. The measurements of TM as a function of x extend the determination of NA©el temperatures by previous neutron diffraction and I¼SR measurements. © 1999 The American Physical Society.