Magnetic and electronic states in (LaMnO3)2(SrMnO3)2 superlattice exhibiting a large negative magnetoresistance

Hironori Nakao, Takaaki Sudayama, Masato Kubota, Jun Okamoto, Yuichi Yamasaki, Youichi Murakami, Hiroyuki Yamada, Akihito Sawa, Kazuaki Iwasa

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9 Citations (Scopus)

Abstract

Magnetic and electronic states in (LaMnO3)2(SrMnO3)2 superlattices fabricated on an (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 substrate, which exhibit a large nontrivial negative magnetoresistance (MR) effect, have been investigated. The crystal structure and the Mn valence state were determined using x-ray scattering measurements near the Mn K edge. These measurements revealed that the Mn valences in the LaMnO3 and SrMnO3 layers are 3+ and 4+, respectively; that is, valence modulation coincides with the La/Sr stacking structure. The Mn spin structure was studied by means of resonant soft x-ray scattering at the Mn L2,3 edge and neutron magnetic scattering measurements. We succeeded in detecting a magnetic signal indicating ferromagnetism at the interface. Finally, we suggest that the origin of the MR is the competition between ferromagnetism at the interface and underlying antiferromagnetism.

Original languageEnglish
Article number245104
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number24
DOIs
Publication statusPublished - 2015 Dec 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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