Diffuse magnetic scattering above TC in quasi-two-dimensional La1.2Sr1.8Mn2O7
Diffuse magnetic scattering above TC in quasi-two-dimensional La1.2Sr1.8Mn2O7
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准二维 La1.2Sr1.8Mn2O7 中 TC 上的漫磁散射
DOI：
10.1103/physrevb.65.134440
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发表时间：
2002
影响因子：
3.7
通讯作者：
A. Revcolevschi
中科院分区：
文献类型：
--
作者：
T. Chatterji;R. Schneider;J. Hoffmann;D. Hohlwein;R. Suryanarayanan;G. Dhalenne;A. Revcolevschi
海森堡和狄拉克于1926年独立引入的交换相互作用是理解材料磁性质的关键，包括技术上相关的巨磁阻（CMR）锰矿石。本文证明了磁转变温度以上的漫射磁散射可以产生交换参数。我们测量了准二维层状锰矿la1的磁漫射散射。2sr1 - 8m2o7在有序温度tc附近表现出CMR行为。通过拟合实验测量的(l)平面上的散射强度分布来模拟平均场计算，我们已经能够确定a-b平面上Mn离子之间以及双分子层两个平面之间的最近邻交换相互作用。
The exchange interaction introduced independently by Heisenberg and Dirac in 1926 is key to understanding magnetic properties of materials, including technologically relevant colossal magnetoresistive (CMR) manganites. Here we show that the diffuse magnetic scattering above the magnetic transition temperature can yield exchange parameters. We have measured the magnetic diffuse scattering from the quasi-two-dimensional hilayer manganite La 1 . 2 Sr 1 - 8 Mn 2 O 7 which shows CMR behavior close to the ordering temperature T C . By fitting the experimentally measured intensity distribution of the diffuse scattering in the (h0l) plane to model mean-field calculations, we have been able to determine the nearest-neighbor exchange interaction between the Mn ions in the a-b plane and also that hetween the two planes of the bilayer.