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

doi:10.1103/physrevb.63.144425

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

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

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 r_R of the rare-earth ion increases. We have found the Mo-O-Mo bond angle increases with r_R from 129.7° for Dy₂Mo₂O₇ (SG) to 131.5° for Nd₂Mo₂O₇ (FM). This behavior is opposite to the so-called Kanamori-Goodenough rule.

Original language	English
Article number	144425
Pages (from-to)	1444251-1444255
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	14
DOIs	https://doi.org/10.1103/physrevb.63.144425
Publication status	Published - 2001
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/physrevb.63.144425

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title = "Chemical pressure control of exchange interaction in Mo pyrochlore",

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.",

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TY - JOUR

T1 - Chemical pressure control of exchange interaction in Mo pyrochlore

AU - Moritomo, Y.

AU - Xu, Sh

AU - Machida, A.

AU - Katsufuji, T.

AU - Nishibori, E.

AU - Takata, M.

AU - Sakata, M.

AU - Cheong, S. W.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

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Chemical pressure control of exchange interaction in Mo pyrochlore

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