Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites.
Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites.
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双层锰氧化物中层间交换和其他结果对自旋波的惊人掺杂依赖性。
DOI：
10.1103/physrevlett.87.217201
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发表时间：
2001
影响因子：
8.6
通讯作者：
Yoshinori Tokura
中科院分区：
文献类型：
--
作者：
T. Perring;D. Adroja;Grégory Chaboussant;G. Aeppli;Tsuyoshi Kimura;Yoshinori Tokura
本文报道了x=0.30，0.35和0.40的双层巨磁阻型锰氧化物La2-2xSr1+2xMn2O7中自旋波的测量结果。对于x=0.35和0.40，整个声色散和光色散关系可以用只有最近邻交换的双层海森堡哈密顿量来很好地描述，这与双交换模型的自旋波寿命一起得到了解释。面内交换对x的依赖性很弱，但两层膜之间的交换变化为4倍，直接揭示了d(3z(2)-r(2))和d(x(2)-y(2))混合轨道性质向主要d(x(2)-y(2))轨道性质的转变。
We report the measurement of spin waves in the bilayer colossal magnetoresistive manganites La2-2xSr1+2xMn2O7 with x = 0.30, 0.35, and 0.40. For x = 0.35 and 0.40 the entire acoustic and optic dispersion relations are well described by those for a bilayer Heisenberg Hamiltonian with nearest-neighbor exchange only, which is explained together with the spin-wave lifetimes by the double exchange model. The in-plane exchange depends weakly on x, but that between the planes of a bilayer changes by a factor of 4, directly revealing a change from mixed d(3z(2)-r(2)) and d(x(2)-y(2)) orbital character to mostly d(x(2)-y(2)).