Spin dynamics of bilayer manganites

Pramana

Tapan Chatterji1¹ 

[1] Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France$$

关键词: Spin waves;    neutron scattering;    colossal magnetoresistance.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The results of inelastic and quasi-elastic neutron scattering investigations on the 40% hole-doped quasi-2D bilayer manganites La1.2Sr1.8Mn2O7 have been reviewed. The complete set of exchange interactions have been determined on the basis of a localized Heisenberg model. However, the spin wave dispersion in La1.2Sr1.8Mn2O7 shows softening close to the zone boundary and are also heavily damped especially close to the zone boundary and deviate from that expected for a simple Heisenberg model. A minimal double exchange model including quantum corrections can reproduce these effects qualitatively but falls short of quantitative agreement.

【 授权许可】

Unknown