Field-induced lattice staircase in a frustrated antiferromagnet CuFe O2

N. Terada, Y. Narumi, K. Katsumata, T. Yamamoto, U. Staub, K. Kindo, M. Hagiwara, Y. Tanaka, A. Kikkawa, H. Toyokawa, T. Fukui, R. Kanmuri, T. Ishikawa, H. Kitamura

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Abstract

The results of synchrotron x-ray diffraction and magnetization measurements on a triangular lattice antiferromagnet CuFe O2 subjected to a pulsed high magnetic field are reported. We find the lattice constant, b, contracts stepwise with increasing magnetic field in coincidence with the multistep magnetization changes. These changes in the lattice constant scale with the magnetization changes. We argue that the competition among the ferromagnetic direct and antiferromagnetic superexchange interactions is a main source for this phenomenon. With the changes of the magnetic structure under an applied magnetic field, the number of up spins increases and the lattice contracts to gain the former exchange energy.

Original languageEnglish
Article number180404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number18
DOIs
Publication statusPublished - 2006 Nov 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Terada, N., Narumi, Y., Katsumata, K., Yamamoto, T., Staub, U., Kindo, K., Hagiwara, M., Tanaka, Y., Kikkawa, A., Toyokawa, H., Fukui, T., Kanmuri, R., Ishikawa, T., & Kitamura, H. (2006). Field-induced lattice staircase in a frustrated antiferromagnet CuFe O2. Physical Review B - Condensed Matter and Materials Physics, 74(18), [180404]. https://doi.org/10.1103/PhysRevB.74.180404