Resonant soft x-ray scattering study on antiferromagnetic ordering of LaSr$_2$Mn$_2$O$_7$

ORAL

Abstract

Resonant soft x-ray scattering experiments at the Mn $L_{2,3}$- edge and O $K$-edge have been performed to probe the magnetic structure of LaSr$_2$Mn$_2$O$_7$ which is well known as the $A$-type antiferromagnetic (AFM) phase. At the low temperature, strongly resonant intensity of (001) AFM reflection was found. The temperature dependences of AFM resonance at both the Mn $L_{2,3} $- and O $K$-edge were relatively different, in which the order parameter at Mn $L_{2,3}$-edge showed an anomalous transition above N$\acute{\rm e}$el temperature (170 K). This feature could be regarded as the mixed valence state (Mn$^{3+}$ and Mn$^{4+}$) phenomenon, and besides, it could be supported by theoretical calculation and bulk measurement on magnetism. Detailed description will be discussed in presentation.

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Authors

  • Jun-Sik Lee

    • eSSC and Dept. of Physics, POSTECH
    • Department of Physics and eSSC, Pohang University of Science and Technology, Pohang, Korea

  • J. Koo

    • eSSC and Dept. of Physics, POSTECH

  • Hoyoung Jang

    • eSSC and Dept. of Physics, POSTECH
    • Department of Physics and eSSC, Pohang University of Science and Technology, Pohang, Korea

  • Kyung-Tae Ko

    • eSSC and Dept. of Physics, POSTECH
    • Department of Physics and eSSC, Pohang University of Science and Technology, Pohang, Korea

  • H. J. Lee

    • eSSC and Dept. of Physics, POSTECH

  • Y. H. Jeong

    • eSSC and Dept. of Physics, POSTECH

  • K.-B. Lee

    • eSSC and Dept. of Physics, POSTECH

  • J.-H. Park

    • eSSC and Dept. of Physics, POSTECH

  • J.-Y. Kim

  • Y. Bang

    • Dept. of Physics, Chonnam National University

  • T. Kimura

    • Dept. of Applied Physics, University of Tokyo

  • Y. Tokura

    • Dept. of Applied Physics, University of Tokyo