Suppressed magnetization in La$_{0.7}$Ca$_{0.3}$MnO$_3$/YBa$_2$Cu$_3$O$_{7-δ}$ superlattices

A. Hoffmann; S. G. E. te Velthuis; Z. Sefroui; J. Santamaria; M. R. Fitzsimmons; S. Park; M. Varela

doi:10.1103/PhysRevB.72.140407

paper

Suppressed magnetization in La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ /YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ superlattices

arXiv:cond-mat/0507123 · doi:10.1103/PhysRevB.72.140407

Abstract

We studied the magnetic properties of La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ / YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ superlattices. Magnetometry showed that with increasing YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ layer thickness the saturation magnetization per La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ layer decreases. From polarized neutron reflectometry we determined that this magnetization reduction is due to an inhomogenous magnetization depth profile arising from the suppression of magnetization near the La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ / YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ interface. Electron energy loss spectroscopy indicates an increased 3d band occupation of the Mn atoms in the La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ layers at the interface. Thus, the suppression of ferromagnetic order at the La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ / YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ interface is most likely due to charge transfer between the two materials.

4 pages, 4 figures, submitted to Phys. Rev. B

Suppressed magnetization in La0.7​Ca0.3​MnO3​/YBa2​Cu3​O7−δ​ superlattices

Abstract

Suppressed magnetization in La $_{0.7}$ Ca $_{0.3}$ MnO $_{3}$ /YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ superlattices