Chemical pressure control of exchange interaction in Mo pyrochlore

Y. Moritomo, Sh Xu, A. Machida, T. Katsufuji, E. Nishibori, M. Takata, M. Sakata, S. W. Cheong

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Abstract

Structural parameters are systematically investigated for Mo pyrochlore R2Mo2O7 (R = Dy, Gd, Sm, and Nd) by means of synchrotron radiation x-ray powder diffraction. This system shows a crossover from the spin-glass (SG) state to the ferromagnetic metallic (FM) state as the averaged ionic radius rR of the rare-earth ion increases. We have found the Mo-O-Mo bond angle increases with rR from 129.7° for Dy2Mo2O7 (SG) to 131.5° for Nd2Mo2O7 (FM). This behavior is opposite to the so-called Kanamori-Goodenough rule.

Original languageEnglish
Article number144425
Pages (from-to)1444251-1444255
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume63
Issue number14
DOIs
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Moritomo, Y., Xu, S., Machida, A., Katsufuji, T., Nishibori, E., Takata, M., Sakata, M., & Cheong, S. W. (2001). Chemical pressure control of exchange interaction in Mo pyrochlore. Physical Review B - Condensed Matter and Materials Physics, 63(14), 1444251-1444255. [144425]. https://doi.org/10.1103/physrevb.63.144425