Hourglass dispersion in overdoped single-layered manganites.
Hourglass dispersion in overdoped single-layered manganites.
复制标题
过掺杂单层锰酸盐中的沙漏分散体。
DOI：
10.1103/physrevlett.108.247209
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发表时间：
2011
影响因子：
8.6
通讯作者：
Markus Braden
中科院分区：
文献类型：
--
作者：
H. Ulbrich;Paul Steffens;D. Lamago;Y. Sidis;Markus Braden
在两个单层锰氧化物，Nd0.33Sr1.67MnO4和Pr0.33Ca1.67MnO4的无公度带状磁有序，被发现表现出沙漏状的激发光谱非常类似于在各种铜酸盐超导体，但只有足够短的相关长度。沙漏色散的几个特征可以被确定：在不相称分支的合并处强度的增强，具有较高能量转移的强度最大值的旋转，以及在低能量处向外色散分支的抑制。磁有序的相关长度和大比例的内到间耦合被确定为决定性的参数，导致沙漏形状的频谱。
The incommensurate stripelike magnetic ordering in two single-layered manganites, Nd0.33Sr1.67MnO4 and Pr0.33Ca1.67MnO4, is found to exhibit an hourglasslike excitation spectrum very similar to that seen in various cuprates superconductors, but only for sufficiently short correlation lengths. Several characteristic features of an hourglass dispersion can be identified: enhancement of intensity at the merging of the incommensurate branches, rotation of the intensity maxima with higher energy transfer, and suppression of the outward-dispersing branches at low energy. The correlation length of the magnetic ordering and the large ratio of intra- to interstripe couplings are identified as the decisive parameters causing the hourglass shape of the spectrum.